Bolus injection assembly and injection apparatus

Abstract

Provided are a bolus injection assembly and an injection apparatus. The bolus injection assembly comprises a support member (40), a torsion member (13), a pressing member (11), an elastic reset member (34), an elastic force accumulation mechanism, a bias device (32), and a piston rod unit. The support member (40) is provided with an injection output end (410). The torsion member (13) is provided with a first engagement portion (134). The elastic force accumulation mechanism is configured for generating bolus injection driving energy. The piston rod unit is mounted in the support member (40) and is provided with a second engagement portion (211). The bias device (32) is provided with a bias engagement portion (324) and is movable between a first working position and a second working position. When the bias device (32) is in the first working position, the bias engagement portion (324) is separated from the second engagement portion (211) and engages with the first engagement portion (134) of the torsion member (13), such that when the torsion member (13) rotates, the torsion member (13) actuates the elastic force accumulation mechanism to rotate through the bias device (32); when the bias device (32) is in the second working position, the bias engagement portion (324) is separated from the first engagement portion (134) and engages with the second engagement portion (211) of the piston rod unit for transferring the bolus injection driving energy of the elastic force accumulation mechanism to the piston rod unit. The bolus injection assembly works stably and reliably, and can also shorten the energy transmission path of the piston rod unit, thereby improving the energy transmission efficiency.

Description

An injection assembly and injection device Technical Field

[0001] This invention relates to the field of injection devices, and more specifically to an injection assembly and an injection device. Background Technology

[0002] Syringes, injection pens, and other injection devices are widely used in the medical industry for drug injection. However, with the development of injection device technology, the functions of injection devices are constantly improving, such as enabling multiple small-dose injections, adjusting the single injection dose, having injection sound output, and display scales.

[0003] Injection devices with dosage adjustment capabilities are favored by the industry because they can meet more drug injection requirements. Among them, the injection assembly, as an important component of the injection device, can generate injection driving energy through an elastic energy storage mechanism to preset the corresponding injection volume. During injection, the injection driving energy of the elastic energy storage mechanism is released and transmitted to the piston rod unit through a corresponding transmission path, so that the piston rod unit can work to perform injection.

[0004] However, some existing injection components are prone to abnormal piston rod unit movement during dosage setting, resulting in poor operational stability. Furthermore, the energy transmission path of the piston rod unit is relatively long, affecting transmission efficiency, thus failing to meet the industry's high requirements.

[0005] In some injection devices, manufacturing errors, assembly errors, and movement gaps can cause insufficient rotation of components, leading to insufficient injection dosage. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, one of the objectives of this invention is to provide an injection assembly that can avoid abnormal piston rod unit movement during dosage setting, ensure stable and reliable operation, and shorten the energy transfer path of the piston rod unit, thereby improving energy transfer efficiency. The invention employs the following technical solution:

[0007] An injection assembly includes a support member, a torsion member, a pressing member, an elastic reset member, an elastic energy storage mechanism, an offset device, and a piston rod unit;

[0008] The supporting component is provided with an injection outlet;

[0009] The torsion member is provided with a first joint and an insertion groove;

[0010] The elastic energy storage mechanism is used to generate injection driving energy;

[0011] The piston rod unit is installed inside the support member and is provided with a second joint.

[0012] The biasing device is provided with a biasing engagement portion; the biasing device is movable between a first working position and a second working position; in the first working position, the biasing engagement portion is separated from the second engagement portion and engages with the first engagement portion of the torsion member to cause the elastic energy storage mechanism to rotate when the torsion member rotates; in the second working position, the biasing engagement portion is separated from the first engagement portion and engages with the second engagement portion of the piston rod unit to transfer the pushing drive energy of the elastic energy storage mechanism to the piston rod unit;

[0013] The pressing member has a push arm that is movably inserted into an insertion slot; the pressing member is used to apply a thrust to the biaser to move the biaser to a second working position when it moves in a direction close to the injection outlet.

[0014] The elastic reset element is used to provide an elastic force that causes the biaser to reset to the first operating position.

[0015] The elastic energy storage mechanism includes a torsional elastic element and a rotating component. The rotating component is rotatably mounted inside the support member. One end of the torsional elastic element is connected to the rotating component, and the other end is connected to the support member.

[0016] The elastic energy storage mechanism generates injection driving energy during forward rotation. The elastic energy storage mechanism also includes a sound-generating element, which can rotate synchronously with the rotating element and move relative to the rotating element. The injection assembly also includes a positioning element. The positioning element is movably installed within a support member and has a third engagement portion for engaging with the support member. When the third engagement portion of the positioning element engages with the support member, the positioning element and support member are anti-rotationally fitted, and the positioning element is used to position the sound-generating element. When the biasing device is in a first working position, the third engagement portion of the positioning element engages with the support member. When the biasing device is in a second working position, the third engagement portion of the positioning element separates from the support member. The pressing element applies a thrust to the positioning element and the sound-generating element as it moves along a direction closer to the injection output end, causing the positioning element and the sound-generating element to move along a direction closer to the injection output end, thereby separating the third engagement portion from the support member. The elastic reset element applies an elastic force to the sound-generating element pointing towards the positioning element. The elastic reset element also provides an elastic force that causes the positioning element to reset to engage with the support member at the third engagement portion.

[0017] The positioning element has multiple unidirectional teeth arranged circumferentially, and the sound-generating element has multiple inclined teeth for meshing with the unidirectional teeth of the positioning element.

[0018] The elastic reset member abuts between the rotating member and the sound-generating member; the biasing device is provided with a flange portion for abutting between the positioning member and the sound-generating member; the pushing arm of the pressing member faces the positioning member.

[0019] The sound-generating component is movably mounted outside the biasing device. The sound-generating component has a sound-generating action surface. The biasing device has a biasing action surface that pushes against the sound-generating action surface to make the sound-generating component rotate in the forward direction when the biasing device rotates in the forward direction. When the biasing device is in the second working position, the sound-generating action surface pushes against the biasing action surface to make the biasing device rotate in the reverse direction when the biasing device rotates in the reverse direction.

[0020] The sound-generating component is provided with a sound-generating component guide slope; the biasing device is provided with a biasing guide slope for slidingly engaging with the sound-generating component guide slope and for pushing against the sound-generating component guide slope to displace the sound-generating component and separate it from the positioning component when the biasing device is in the first working position and rotates in the opposite direction.

[0021] The biasing device is provided with a first biasing protrusion and a second biasing protrusion. The biasing action surface is located on one side of the first biasing protrusion, and the other side of the first biasing protrusion forms a biasing stop. The biasing guide slope is formed on the second biasing protrusion. The sound-generating element is provided with a first sound-generating element groove for the first biasing protrusion to be movably embedded in and a second sound-generating element groove for the second biasing protrusion to be embedded in. The groove sidewall of the first sound-generating element groove opposite to the biasing action surface forms the sound-generating element action surface. The groove sidewall of the first sound-emitting element groove, which is opposite to the offset stop, forms the sound-emitting element stop. The groove wall of the second sound-emitting element groove, which is opposite to the offset guide slope, forms the sound-emitting element guide slope. When the sound-emitting element working surface is in contact with the offset working surface, there is a gap between the offset stop and the sound-emitting element stop. When the offset device is in the first working position and rotates in the opposite direction, using the offset guide slope to push against the sound-emitting element guide slope, when the offset stop and the sound-emitting element stop are in contact, the sound-emitting element separates from the positioning element.

[0022] The sound-generating component is provided with an elastic reset part, and the biasing device is provided with a top abutment. The elastic reset part is used to abut against the top abutment.

[0023] When the bias joint engages with the first joint, the torsion member and the biaser rotate synchronously in cooperation; when the bias joint engages with the second joint, the biaser and the piston rod unit rotate synchronously in cooperation.

[0024] The piston rod unit includes a linkage member rotatably mounted within a support member, and the second engagement portion is disposed on the linkage member; the injection assembly also includes a compensating transmission structure, which causes the linkage member to rotate when the biaser moves toward the second working position.

[0025] The biased joint is provided with a pushing surface; the compensation transmission structure includes the pushing surface, which is used to push the second joint to make the linkage rotate when the biaser moves toward the second working position.

[0026] The second joint is provided with a mating surface that matches the pushing surface, and the mating surface is used for the pushing surface to push against it.

[0027] Both the pushing surface and the mating surface are inclined surfaces; or, both the pushing surface and the mating surface are curved surfaces.

[0028] The second engagement portion includes a plurality of mating teeth arranged in a circumferentially spaced manner, and the biased engagement portion includes a plurality of second biasing teeth arranged in a circumferentially spaced manner; a second engagement slot is formed between any two adjacent mating teeth, and when the biased engagement portion engages with the second engagement portion, the second biasing teeth are inserted into the second engagement slot.

[0029] The pushing surface is located at the lower end of the second biasing tooth. When the biasing engagement part engages with the second engagement part and the biaser rotates, the tooth sidewall of the second biasing tooth is used to push against the tooth sidewall of the engaging tooth to make the linkage rotate.

[0030] The piston rod unit includes a piston rod; when the linkage rotates, the piston rod is used to generate axial displacement.

[0031] The piston rod unit includes a piston; the piston rod is threadedly connected to a support member, the piston rod rotates synchronously with a linkage member, and can move relative to the linkage member; the piston is mounted on the piston rod.

[0032] The torsion member is rotatably mounted on the support member, and the elastic energy storage mechanism is located inside the support member; the pressing member is movably mounted on the torsion member.

[0033] The second objective of this invention is to provide an injection device that employs the aforementioned injection assembly. This avoids abnormal piston rod unit movement during dosage setting, ensuring stable and reliable operation. Furthermore, it shortens the energy transfer path of the piston rod unit, improving energy transfer efficiency. The technical solution adopted is as follows:

[0034] The injection device includes a dose accumulation component and the aforementioned injection component. The dose accumulation component is disposed between the torsion member and the support member. A drug storage unit is provided on the support member, and the piston rod unit is used to push the drug solution in the drug storage unit toward the injection output end.

[0035] The third objective of this invention is to provide an injection device that ensures stable and reliable operation, and it adopts the following technical solution:

[0036] Injection device, including:

[0037] Transmission mechanism, rotary feed assembly and power source;

[0038] The transmission mechanism includes:

[0039] Actuator, drive sleeve and transmission assembly;

[0040] The transmission assembly is connected to the drive sleeve via a circumferential guiding structure;

[0041] When the actuator is pressed, the transmission assembly, under the thrust of the actuator, can generate a circumferential displacement relative to the drive sleeve by means of the circumferential guiding structure.

[0042] The drive sleeve is connected to the power source in a transmission connection;

[0043] The power source is used to set the driving force during dose setting and to provide power to the rotary feed assembly using the driving force during injection;

[0044] The rotary feed assembly includes a rotary cylinder and a screw;

[0045] The transmission assembly is slidably sleeved on the outside of the rotating cylinder;

[0046] When the actuator is pressed, it first pushes the transmission assembly to move axially until an anti-rotation connection is established between the transmission assembly and the rotating cylinder. Then, with the help of the circumferential guiding structure and under the thrust of the actuator, the transmission assembly generates the circumferential displacement relative to the drive sleeve.

[0047] The circumferential displacement causes the rotating cylinder to rotate in the same direction, and the rotation of the rotating cylinder in the same direction drives the screw to feed axially.

[0048] The transmission assembly includes an offset cylinder.

[0049] The power source and the drive sleeve constitute a power assembly. The injection device also includes a dosage knob. During dosage setting, the rotation of the dosage knob can set the driving force of the power assembly.

[0050] The distal inner wall of the biasing cylinder is also formed with a first clutch tooth, and the proximal inner wall is formed with a second clutch tooth. The outer part of the dosing knob is a cylindrical operating part, and the inner part of the operating part extends axially to form a cylindrical joint, the outer wall of which forms a first clutch groove; the distal outer wall of the rotating cylinder forms a second clutch groove;

[0051] When the actuator is in its initial position, the first clutch groove and the first clutch tooth are engaged, and the bias cylinder and the dosage knob are anti-rotationally connected. Meanwhile, the second clutch groove and the second clutch tooth are disengaged, and the bias cylinder can rotate relative to the rotating cylinder.

[0052] When the actuator is pressed down, the actuator also pushes the bias cylinder to move to the distal end. The first clutch tooth disengages from the first clutch groove, and the second clutch tooth and the second clutch groove engage, thereby disengaging the bias cylinder from the dose knob and establishing a rotational lock state with the rotating cylinder.

[0053] The transmission assembly includes a sound-emitting tube;

[0054] One of the sound-generating cylinder and the biasing cylinder is connected to the drive sleeve through the circumferential guiding structure, and the sound-generating cylinder is axially abutted against the outside of the biasing cylinder;

[0055] The biasing cylinder is slidably sleeved on the outside of the rotating cylinder;

[0056] When the actuator is pressed, it first pushes the sound-emitting cylinder and the bias cylinder to move axially until an anti-rotation connection is established between the bias cylinder and the rotating cylinder. Then, with the help of the circumferential guiding structure and under the thrust of the actuator, both the sound-emitting cylinder and the bias cylinder generate the circumferential displacement relative to the drive sleeve.

[0057] The circumferential displacement causes the rotating cylinder to rotate in the same direction via the biasing cylinder, and after the rotating cylinder rotates in the same direction, it drives the screw to feed axially.

[0058] The inner wall of the sound-emitting tube is formed with a stop groove, and the outer wall of the biasing tube is formed with a stop portion.

[0059] When the sound-emitting cylinder generates the circumferential displacement or rotates in the same direction as the circumferential displacement, it can drive the bias cylinder to rotate in the same direction by means of the contact between the stop groove and the stop part.

[0060] The injection device also includes a return spring, which is disposed between the axial end faces of the sound-generating cylinder and the drive sleeve.

[0061] The biasing cylinder has a clutch tooth at its proximal end and a clutch groove at its distal end. When the actuator is pressed down, it pushes the biasing cylinder to move until the clutch tooth engages with the clutch groove, so that the biasing cylinder and the rotating cylinder establish an anti-rotation connection.

[0062] The injection device also includes a ratchet component;

[0063] The ratchet is disposed between the actuator and the sound-emitting tube. When the actuator is pressed, the thrust is transmitted to the sound-emitting tube through the ratchet.

[0064] The injection device includes a housing assembly. The distal end of the ratchet member is connected to the housing assembly via a clutch structure, and the proximal end of the ratchet member is connected to the distal end of the sound-generating cylinder via a one-way rotation structure. When the actuator is not pressed, the ratchet member is anti-rotationally connected to the housing assembly via the clutch structure, and the one-way rotation structure in the engaged state prevents the sound-generating cylinder from rotating in the same direction as the circumferential displacement. When the actuator is pressed, the ratchet member disengages from the anti-rotational connection with the housing assembly, allowing the sound-generating cylinder to drive the ratchet member to rotate in the same direction as the circumferential displacement.

[0065] The circumferential guiding structure includes a lateral protrusion and a guide rail. The lateral protrusion is embedded in the guide rail. One of the lateral protrusion and the guide rail is disposed on the drive sleeve, and the other is disposed on the transmission assembly.

[0066] The guide rail includes a sloping groove section with its two ends offset in the circumferential direction and a straight groove section at the far end. When the actuator is not pressed, the lateral protrusion is located in the straight groove section. When the actuator is pressed, under the guiding action of the straight groove section, the transmission assembly first generates an axial displacement until the lateral protrusion enters the sloping groove section. The relative movement between the lateral protrusion and the sloping groove section in the extension direction of the sloping groove section causes the transmission assembly to generate the circumferential displacement relative to the drive sleeve.

[0067] The lateral protrusion is disposed at the end of an axially extending spring arm.

[0068] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0069] (1) It can avoid abnormal movement of the piston rod unit during dosage setting, and the operation is stable and reliable. In addition, it can shorten the energy transmission path of the piston rod unit and improve the energy transmission efficiency. Furthermore, by reasonably setting the installation relationship between the torsion part and the pressing part, it can facilitate installation and make the structure more compact. It is simple and convenient to operate, which is conducive to promotion.

[0070] (2) It can compensate for the rotation amplitude of the linkage, thereby improving the problem of insufficient rotation amplitude of the linkage caused by the existence of manufacturing error, assembly error and movement clearance. In turn, when used in an injection device, it can improve the problem of insufficient injection dosage caused by insufficient rotation amplitude of the linkage.

[0071] (3) The transmission mechanism employs an actuator, a drive sleeve, and a transmission assembly. The transmission assembly is connected to the drive sleeve via a circumferential guiding structure. When the actuator is pressed, the transmission assembly, under the thrust of the actuator, can generate a circumferential displacement relative to the drive sleeve through the circumferential guiding structure. Thus, when the user presses the actuator to inject, the transmission mechanism converts the force exerted by the user pressing the actuator into a circumferential displacement of the transmission assembly relative to the drive sleeve. This circumferential displacement compensates for the transmission attenuation problem and improves the attenuation of the rotation angle of the drive sleeve transmitted to the rotating cylinder due to manufacturing errors, assembly errors, and movement gaps, thereby achieving injection dose compensation.

[0072] (4) By providing a stop on the linkage component and an elastic reset part on the transmission component, when the stored energy of the syringe is the corresponding zero-scale set dose, the dose setting is adjusted back. The transmission component and the linkage component move relative to each other. The elastic reset part is abutted by the stop and deforms to generate reset energy. The reset energy generated by the elastic deformation of the elastic reset part acts directly on the linkage component, which helps the linkage component to reset quickly. Moreover, its structure is relatively simple and easy to manufacture. On the basis of the stop on the linkage component and the elastic reset part on the transmission component, the elastic element can be combined to play a dual driving role with the help of the elastic reset part and the elastic element, which further improves the timeliness of the linkage component reset and enables the rapid response and reset after the zero-scale set dose is adjusted back, so as to improve the injection accuracy and reliability of the syringe of the application mechanism. Attached Figure Description

[0073] Figure 1 is a cross-sectional view of the injection component of the present invention;

[0074] Figure 2 is an enlarged view of the upper part of Figure 1;

[0075] Figure 3 is a cross-sectional view of the injection component of the present invention from another direction;

[0076] Figure 4 is an exploded view of the injection assembly of the present invention;

[0077] Figure 5 is an exploded view of the elastic energy storage mechanism;

[0078] Figure 6 is a schematic diagram of the meshing and engagement between the positioning component and the sound-generating component;

[0079] Figure 7 is an enlarged view of the engagement between the positioning component and the sound-generating component;

[0080] Figure 8 is a schematic diagram of the separation state of the positioning component and the sound-generating component;

[0081] Figure 9 is an enlarged view of the separation state of the positioning component and the sound-generating component;

[0082] Figure 10 is a schematic diagram of the fit between the scale ring and the support component;

[0083] Figure 11 is a schematic diagram of the torsion member;

[0084] Figure 12 is a schematic diagram of the torsion component from another direction;

[0085] Figure 13 is a schematic diagram of the positioning component;

[0086] Figure 14 is a schematic diagram of the bias device;

[0087] Figure 15 is a schematic diagram of the sound-generating component;

[0088] Figure 16 is a cross-sectional view of the bias device;

[0089] Figure 17 is a cross-sectional view of the pressing component;

[0090] Figure 18 is a schematic diagram of the linkage component;

[0091] Figure 19 is a schematic diagram of the separation state of the bias joint and the second joint;

[0092] Figure 20 is a structural schematic diagram of another embodiment of the linkage;

[0093] Figure 21 is a schematic diagram of another embodiment of the biaser;

[0094] Figure 22 is a schematic diagram showing the state in which the biased joint moves toward the second joint.

[0095] Figure 23 is a schematic diagram of the state of the pushing surface and the pushing mating surface;

[0096] Figure 24 is a schematic diagram of the engagement state between the biased joint and the second joint;

[0097] Figure 25 is a schematic diagram of the transmission device, which also shows the structure of the syringe reset mechanism;

[0098] Figure 26 is a perspective view of the transmission device, which also shows the structure of the syringe's reset mechanism;

[0099] Figure 27 is an exploded view of the transmission device, which also shows the structure of the syringe reset mechanism;

[0100] Figure 28 is a schematic diagram of the engagement state between the transmission component and the ratchet when the linkage component rotates in the first direction;

[0101] Figure 29 is a schematic diagram of the engagement state between the elastic reset part and the top abutment when the linkage component rotates in the first direction;

[0102] Figure 30 is a schematic diagram of the transmission component;

[0103] Figure 31 is a schematic diagram of the transmission component from another direction;

[0104] Figure 32 is a structural schematic diagram of the linkage component;

[0105] Figure 33 is a schematic diagram of the linkage component from another direction;

[0106] Figure 34 is a schematic diagram of the linkage component and the rotating component;

[0107] Figure 35 is a schematic diagram showing that the first toothed unit and the second toothed unit are not engaged.

[0108] Figure 36 is a schematic diagram of the engagement state of the first toothed unit and the second toothed unit;

[0109] Figure 37 is a side view of the second mating tooth;

[0110] Figure 38 is a front view of the second mating tooth;

[0111] Figure 39 is a schematic diagram of the internal structure of the linkage component;

[0112] Figure 40 is a schematic diagram of the transmission mechanism;

[0113] Figure 41 is a schematic diagram of the rotary feed assembly;

[0114] Figure 42 is a structural exploded view of the injection device including the transmission mechanism.

[0115] Figure 43 is a schematic diagram of the injection device including the transmission mechanism in different states;

[0116] Figure 44 is a schematic diagram of the sound-generating tube;

[0117] Figure 45 is a schematic cross-sectional view of the drive sleeve.

[0118] Figure 46 is a schematic diagram of the rotating cylinder;

[0119] Figure 47 is a schematic diagram showing the movement of the lateral protrusion in conjunction with the guide rail. Detailed Implementation

[0120] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0121] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0122] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0123] In a first aspect, referring to Figures 1 to 18, the following embodiments of this application disclose a push assembly, including a support member 40, a torsion member 13, a pressing member 11, an elastic reset member 34, an elastic energy storage mechanism, an offset device 32, and a piston rod unit.

[0124] The support member 40 is provided with an injection output end 410;

[0125] The torsion member 13 is provided with a first joint portion 134;

[0126] The elastic energy storage mechanism is used to generate injection driving energy;

[0127] The piston rod unit is installed inside the support member 40 and is provided with a second joint 211;

[0128] The biasing device 32 is provided with a biasing engagement portion 324; the biasing device 32 is movable between a first working position and a second working position; in the first working position, the biasing engagement portion 324 is separated from the second engagement portion 211 and engages with the first engagement portion 134 of the torsion member 13 to cause the elastic energy storage mechanism to rotate when the torsion member 13 rotates; in the second working position, the biasing engagement portion 324 is separated from the first engagement portion 134 and engages with the second engagement portion 211 of the piston rod unit to transfer the pushing drive energy of the elastic energy storage mechanism to the piston rod unit.

[0129] The pressing member 11 is used to apply a thrust to the biaser 32 as it moves along the direction close to the injection output end 410, so that the biaser 32 moves to the second working position;

[0130] The elastic reset member 34 is used to provide an elastic force that causes the biaser 32 to reset to the first working position.

[0131] During dosage setting, the bias device 32 is in the first working position. By rotating the torsion member 13 in the forward direction, the bias device 32 acts on the elastic energy storage mechanism, causing the elastic energy storage mechanism to rotate in the forward direction and generating injection driving energy. During injection, by moving the pressing member 11 in the direction close to the injection output end 410, the pressing member 11 applies a thrust to the bias device 32 to move the bias device 32 to the second working position. The injection driving energy released by the elastic energy storage mechanism can be transmitted to the piston rod unit through the bias device 32 to make the piston rod unit work. After injection is completed, the elastic force of the elastic reset member 34 causes the bias device 32 to reset to the first working position. Therefore, during dosage setting, the bias device 32 is located in the first working position, the bias engagement 324 engages with the first engagement 134 of the torsion member 13 and separates from the second engagement 211, so that the bias device 32 acts on the elastic energy storage mechanism, and the transmission between the bias device 32 and the piston rod unit is cut off. This avoids the bias device 32 acting on the piston rod unit, thereby avoiding abnormal movement of the piston rod unit during dosage setting. The operation is stable and reliable. Moreover, during injection, the injection drive energy of the elastic energy storage mechanism is transmitted to the piston rod unit through the bias device 32, which can shorten the injection drive energy transmission path of the piston rod unit and improve efficiency.

[0132] In the first working position, the biasing engagement 324 of the biasing device 32 separates from the second engagement 211 and engages with the first engagement 134 of the torsion member 13 to cause the elastic storage mechanism to rotate when the torsion member 13 rotates. The phrase "causing the elastic storage mechanism to rotate when the torsion member 13 rotates by the biasing device 32 acting on the elastic storage mechanism" can mean that the elastic storage mechanism rotates under the drive of the biasing device 32 when the torsion member 13 rotates, or that the elastic storage mechanism is linked to its own elastic torque and rotates when the torsion member 13 rotates by the biasing device 32 acting on the elastic storage mechanism.

[0133] The elastic energy storage mechanism includes a torsional elastic element 36 and a rotating member 35. The rotating member 35 is rotatably mounted within the support member 40. One end of the torsional elastic element 36 is connected to the rotating member 35, and the other end is connected to the support member 40. When the biasing device 32 is in the first working position, the torsional member 13 is rotated in the forward direction. At this time, the biasing device 32 acts on the elastic energy storage mechanism, causing the rotating member 35 of the elastic energy storage mechanism to rotate in the forward direction. During the forward rotation of the rotating member 35, the torsional elastic element 36 is torsioned in the forward direction, generating elastic torque, thereby generating injection driving energy. When the biasing device 32 is in the second working position, the injection driving energy can be released by the elastic recovery of the torsional elastic element 36. By rotating the rotating member 35 to different rotation amplitudes, the torsional elastic element 36 can be torsioned to different tension states, thereby generating different elastic torques and different injection driving energies. This allows different injection amounts (i.e., dosages) to be set, so that in the subsequent injection process, the corresponding injection driving energy can be transmitted to the piston rod unit, so that the piston rod unit can inject according to the preset dosage under the drive of the corresponding injection driving energy.

[0134] In this embodiment, the torsional elastic element 36 can be an elastic element such as a torsion spring. The forward rotation is clockwise rotation, and the reverse rotation is counterclockwise rotation.

[0135] In this embodiment, the elastic energy storage mechanism is located within the support member 40.

[0136] The elastic energy storage mechanism generates injection driving energy during forward rotation. The elastic energy storage mechanism also includes a sound-generating element 33, which rotates synchronously with the rotating element 35 and is movable relative to the rotating element 35. The injection assembly also includes a positioning element 15. The positioning element 15 is movably installed within the support member 40, and the positioning element 15 is provided with a third engagement portion 152 for engaging with the support member 40. When the third engagement portion 152 of the positioning element 15 engages with the support member 40, the positioning element 15 engages with the support member 40 in an anti-rotational manner and serves to position the sound-generating element 33. When the biasing device 32 is in the first working position, the positioning element 15... The third engagement 152 engages with the support member 40; when the biaser 32 is in the second working position, the third engagement 152 of the positioning member 15 separates from the support member 40; the pressing member 11 is used to apply a thrust to the positioning member 15 and the sound-emitting member 33 as it moves in a direction close to the injection output end 410, so that the positioning member 15 and the sound-emitting member 33 move in a direction close to the injection output end 410 to separate the third engagement 152 from the support member 40; the elastic reset member 34 is used to apply an elastic force to the sound-emitting member pointing towards the positioning member 15, and the elastic reset member 34 is also used to provide an elastic force that causes the positioning member 15 to reset to the engagement of the third engagement 152 with the support member 40.During dosage setting, the bias device 32 is in the first working position. By rotating the torsion member 13 in the forward direction, the bias device 32 acts on the elastic energy storage mechanism, causing the rotating member 35 and the sound-emitting member of the elastic energy storage mechanism to rotate in the forward direction. The torsional elastic element 36 rotates in the forward direction to generate injection driving energy. Then, the positioning member 15 positions the sound-emitting member 33 so that the elastic energy storage mechanism is maintained at the corresponding rotation amplitude, and the torsional elastic element 36 is maintained in the corresponding torsional state to prevent the torsional elastic element 36 from rotating in the opposite direction and restoring its elasticity, thereby storing the corresponding injection driving energy to set the corresponding dosage. During injection, when the pressing member 11 is pressed and moves along the direction close to the injection output end 410, a thrust is applied to the bias device 32 to move the bias device 32 to the second working position. A thrust is applied to the positioning member 15 and the sound-emitting member 33 to move them along the direction close to the injection output end 410. To separate the third joint 152 from the support member 40, the anti-rotational engagement between the positioning member 15 and the support member 40 is released. At this time, the positioning member 15 can rotate relative to the support member 40, thereby releasing the positioning effect on the elastic energy storage mechanism. The positioning member 15, the sound-emitting member 33, and the rotating member 35 rotate in opposite directions under the action of the elastic torque of the torsional elastic element 36, and are transmitted to the piston rod unit through the biaser 32, thereby realizing the transmission of the pushing drive energy of the elastic energy storage mechanism to the piston rod unit, and removing the pressing force of the pressing member 11. The elastic reset member 34 applies an elastic force to the sound-emitting member 33 pointing towards the positioning member 15 to reset the engagement state between the sound-emitting member 33 and the positioning member 15, and the elastic force of the elastic reset member 34 causes the biaser 32 to reset to the first working position, causing the positioning member 15 to reset to the elastic force of the engagement between the third joint 152 and the support member 40.

[0137] The synchronous rotational fit refers to the situation where, when one of the objects in the synchronous rotational fit rotates, the other objects in the synchronous rotational fit also rotate.

[0138] The positioning member 15 has multiple unidirectional teeth 151 arranged circumferentially, and the sound-generating member 33 is provided with multiple inclined teeth 331 for meshing with the unidirectional teeth 151 of the positioning member 15. When the biasing device 32 is in the first working position, the third engagement portion 152 of the positioning member 15 engages with the support member 40. By rotating the torsion member 13 in the forward direction, the sound-generating member 33 rotates in the forward direction relative to the positioning member 15 under the drive of the biasing device 32. During the forward rotation of the sound-generating member, the inclined teeth 331 slide along the inclined surfaces of the unidirectional teeth 151. Each time the inclined teeth 331 pass over a unidirectional tooth 151, the inclined teeth 331 move towards the injection output end 410 relative to the unidirectional teeth 151 of the positioning member 15, forming a... After a brief separation, the sound-generating element 33 is pushed towards the positioning element 15 by the elastic reset element 34. The inclined tooth 331 meshes with the next one-way tooth 151. That is, the sound-generating element rotates one tooth relative to the positioning element 15 in the positive direction. After rotation, the two continue to mesh. The sound is generated by the sliding impact between the inclined tooth 331 and the one-way tooth 151, which can play the role of setting the dosage of the sound-generating element in the positive direction. The positive rotation of the sound-generating element 33 can drive the rotating element 35 to rotate in the positive direction, so as to drive the torsional elastic element 36 to twist and generate the injection driving energy. After the torsion member 13 rotates to its position during the dosage setting period, the torsion elastic element 36 causes the sound-generating element to have a tendency to rotate in the opposite direction. At this time, the inclined teeth 331 of the sound-generating element meshes with the one-way teeth 151, and the tendency of the sound-generating element to rotate in the opposite direction is blocked. Thus, the sound-generating element 33 can be positioned by the engagement of the one-way teeth 151 of the positioning member 15 with the multiple inclined teeth 331 of the sound-generating element 33, so that the sound-generating element 33 and the rotating member 35 are kept at the corresponding rotation amplitude, and the torsion elastic element 36 is kept in the corresponding torsional state to prevent the torsion elastic element 36 from rotating in the opposite direction.

[0139] The one-way tooth 151 of the positioning member 15 can adopt the existing one-way transmission structure, such as having a helical tooth surface and a straight stop surface.

[0140] Of course, in addition to this, the positioning member 15 can also adopt other structures, as long as it can realize the positioning of the sound-emitting element. For example, the positioning member 15 can be a positioning seat with multiple positioning holes, and the sound-emitting element is provided with balls and springs that cooperate with the positioning holes. However, the most preferred embodiment of the present invention is to arrange multiple one-way teeth 151 circumferentially on the positioning member 15 and to provide multiple inclined teeth 331 on the sound-emitting element for meshing with the one-way teeth 151 of the positioning member 15. On the one hand, when the third joint 152 of the positioning member 15 is engaged with the support member 40, and during the dose setting period... When the torsion member 13 is rotated into position, the engagement of the one-way tooth 151 and the inclined tooth 331 ensures stable positioning. On the other hand, during dosage setting, the bias device 32 is in the first working position. When the torsion member 13 is rotated in the forward direction, the bias device 32 acts on the sound-generating element of the elastic energy storage mechanism. The inclined tooth 331 can slide along the tooth inclination of the one-way tooth 151 to reach other one-way teeth 151, thereby realizing one-way transmission. The sliding collision between the inclined tooth 331 and the one-way tooth 151 generates sound, which can play the role of sound generation for forward dosage setting. It has the advantages of simple structure and convenient forward adjustment.

[0141] In this embodiment, the positioning element 15 is a ratchet. Of course, other components can also be used, as long as they have multiple unidirectional teeth 151 arranged circumferentially.

[0142] The support member 40 is provided with a support engagement portion for the third engagement portion 152. The third engagement portion 152 consists of a plurality of ratchet teeth arranged circumferentially on the positioning member 15. The support engagement portion includes a plurality of support slots 411 arranged circumferentially on the inner wall of the support member 40 for the ratchet teeth to be inserted into. By having the ratchet teeth inserted one-to-one into the support slots 411, the third engagement portion 152 can be engaged with the support member 40, thereby restricting the rotation of the positioning member 15 relative to the support member 40 and achieving anti-rotational engagement between the positioning member 15 and the support member 40. When the positioning member 15 moves to the point where the ratchet teeth separate from the support slots 411, the positioning member 15 can rotate relative to the support member 40.

[0143] Of course, the third joint 152 can also adopt other structures, as long as it can achieve anti-rotational engagement between the positioning member 15 and the support member 40. For example, the third joint 152 is a plurality of ratchet slots circumferentially arranged on the positioning member 15, and a plurality of support teeth are arranged circumferentially on the inner wall of the support member 40, which are respectively inserted into the plurality of ratchet slots. By the plurality of support teeth being respectively inserted into the plurality of ratchet slots, the third joint 152 can be engaged with the support member 40, thereby restricting the rotation of the positioning member 15 relative to the support member 40 and achieving anti-rotational engagement between the positioning member 15 and the support member 40. When the positioning member 15 moves to the point where the ratchet slot and the support teeth are separated, the positioning member 15 can rotate relative to the support member 40.

[0144] The supporting joint is provided with a limiting wall 412 on the side away from the injection output end 410 to block and limit the third joint 152. The positioning member 15 includes a positioning collar 153, the one-way tooth 151 is provided at the bottom of the positioning collar 153, the positioning collar 153 is provided with an outwardly extending convex ring 154, and the ratchet teeth are circumferentially arranged on the convex ring 154.

[0145] In this embodiment, the end of the sound-generating element near the injection output end 410 is located inside the rotating element 35. Specifically, the rotating element 35 is provided with a rotating slot extending along its axial direction, and the sound-generating element is provided with a sound-generating element protrusion 339 that is embedded in the rotating slot and can move along the extension direction of the rotating slot. Through the engagement of the sound-generating element protrusion 339 with the rotating slot, the sound-generating element and the rotating element 35 can rotate synchronously and can move relative to the rotating element 35.

[0146] Of course, in addition, the sound-emitting component is provided with a sound-emitting component slot, and the rotating component 35 may also be provided with a rotating protrusion extending along its axial direction. The rotating protrusion is embedded in the sound-emitting component slot and can move along the extension direction of the sound-emitting component slot, which also allows the sound-emitting component and the rotating component 35 to rotate synchronously and cooperate, and can move relative to the rotating component 35.

[0147] The elastic reset member 34 abuts against the rotating member 35 and the sound-emitting member; the biasing member 32 is provided with a flange portion 325 for abutting against the positioning member 15 and the sound-emitting member; the pressing member 11 is provided with a pushing arm 111 facing the positioning member 15. When the pressing member 11 is pressed and moves along the direction close to the injection output end 410, the pushing force applied to the positioning member 15 by the pushing arm 111 can be transmitted to the biasing member 32 and the sound-emitting member 33, thereby causing the positioning member 15, the biasing member 32 and the sound-emitting member to move together towards the direction close to the injection output end 410 under the pushing force of the positioning member 15, so that the biasing member 32... When the device moves to the second working position, the positioning member 15 moves to the third engagement 152 and separates from the support member 40. At this time, the elastic reset member 34 is compressed as the sound-emitting member moves closer to the injection output end 410. When the pressing force on the pressing member 11 is removed, the elastic reset member 34 elastically elongates. The positioning member 15, the biasing device 32, and the sound-emitting member move together in a direction away from the injection output end 410 under the elastic force of the elastic reset member 34, causing the sound-emitting member to reset its engagement with the positioning member 15, the biasing device 32 to reset to the first working position, and the positioning member 15 to reset to the third engagement 152 and engage with the support member 40.

[0148] In this embodiment, the elastic reset member 34 may be a spring, an elastic sheet, or the like.

[0149] In this embodiment, the injection assembly further includes a pad 14, which is used to abut against the positioning member 15 and the push arm 111 so that when the pressing member 11 is pressed and moved in a direction close to the injection output end 410, the thrust of the push arm 111 can be indirectly applied to the positioning member 15, the biaser 32 and the sound-emitting member through the pad 14.

[0150] In this embodiment, the torsion member 13 is rotatably mounted on the support member 40, and the pressing member 11 is movably mounted on the torsion member 13. Specifically, the torsion member 13 is provided with an insertion slot 135, and the pushing arm 111 is movably inserted into the insertion slot 135, so that the pressing member 11 can move relative to the torsion member 13, facilitating installation and making the structure more compact. In this embodiment, the extension trajectory of the insertion slot 135 is arc-shaped, and the extension trajectory of the pushing arm 111 matches it.

[0151] Of course, the pressing member 11 can also be mounted on the support member 40, as long as it can apply a thrust to the positioning member 15, the biasing device 32 and the sound-emitting member when the pressing member 11 moves in the direction close to the injection output end 410 to achieve its function. However, the most preferred embodiment of the present invention is to movably mount the pressing member 11 on the torsion member 13, which can make the structure compact and reduce the volume.

[0152] The sound-generating element 33 is movably mounted outside the biasing device 32. The sound-generating element has a sound-generating action surface 334. The biasing device 32 has a biasing action surface 323 that pushes against the sound-generating action surface 334 to cause the sound-generating element to rotate in the forward direction when the biasing device 32 rotates forward. When the biasing device 32 is in the second working position, the sound-generating action surface 334 pushes against the biasing action surface 323 to cause the biasing device 32 to rotate in the reverse direction when the biasing device 32 rotates in the reverse direction. During the forward dose setting period, the biasing device 32 is in the first working position. When the torsion member 13 rotates forward, the torsion member 13 drives the biasing device 32 to rotate forward. During the forward rotation of the biasing device 32, the biasing action surface 323 of the biasing device 32 pushes against the sound-generating action surface 334, causing the sound-generating element and the rotating member 35 to rotate forward. This causes the torsional elastic element 36 to twist along with the forward rotation of the rotating member 35, generating elastic torque, thereby generating injection drive energy. During injection, pressing the pressing member 11 moves it towards the injection output end 410, and the pushing force applied by the pressing member 11 moves the positioning member 15, the biasing device 32, and the sound-emitting device together towards the injection output end 410, so that the biasing device 32 moves to the second working position, and the positioning member 15 moves to the third engagement 152 and separates from the support member 40. At this time, the elastic reset member 34 is compressed. Since the third engagement 152 separates from the support member 40, the anti-rotational engagement between the positioning member 15 and the support member 40 is released. At this time, the positioning member 15 can rotate relative to the support member 40, so that the positioning member 15, the sound-emitting device, and the rotating member 35 are in contact with the torsional elastic element 36. Under the action of the torque, the sound-emitting component rotates in the opposite direction. Then, the sound-emitting component's action surface 334 pushes against the biasing action surface 323, causing the biasing device 32 to rotate in the opposite direction. The reverse rotation is transmitted to the piston rod unit through the biasing device 32, thereby transmitting the pushing drive energy of the elastic energy storage mechanism to the piston rod unit through the biasing device 32 in a transmission manner. When the pressing force of the pressing component 11 is removed, the positioning component 15, the biasing device 32, and the sound-emitting component move together in a direction away from the injection output end 410 under the action of the elastic force of the elastic reset component 34. This causes the sound-emitting component to reset its engagement state with the positioning component 15, the biasing device 32 to reset to the first working position, and the positioning component 15 to reset to the third joint 152 and engage with the support member 40.

[0153] The sound-generating component is provided with a sound-generating component guide slope 335; the biasing device 32 is provided with a biasing guide slope 326 for slidingly engaging with the sound-generating component guide slope 335 and for pushing against the sound-generating component guide slope 335 to displace the sound-generating component and separate it from the positioning component 15 when the biasing device 32 is in the first working position and rotates in the opposite direction. During dosage setting, the bias device 32 is in the first working position. When the torsion member 13 is rotated in the reverse direction, the torsion member 13 drives the bias device 32 to rotate in the reverse direction. During the reverse rotation of the bias device 32, the sound-emitting element is blocked by the positioning member 15. The bias guide slope 326 of the bias device 32 pushes against the sound-emitting element guide slope 335, causing the sound-emitting element to shift and separate from the positioning member 15. At this time, the positioning function of the positioning member 15 for the sound-emitting element is lost. The sound-emitting element and the rotating member 35 rotate in the opposite direction under the elastic torque of the torsion elastic element 36. Then, under the elastic force of the elastic reset member 34, the sound-emitting element resets to engage with the positioning member 15. In this way, the dosage can be corrected by reverse dosage adjustment. When the sound-emitting element moves to engage with the positioning member 15, the inclined teeth 331 of the sound-emitting element hit the one-way teeth 151 of the positioning member 15 to generate sound, thereby achieving the effect of reverse dosage adjustment sound generation. By providing a sound-generating guide slope 335 on the sound-generating component and a bias guide slope 326 on the biaser 32 that slides in cooperation with the sound-generating guide slope 335, when the forward rotation of the torsion member 13 generates excessive injection driving energy, it can be adjusted in the reverse direction to reduce the injection driving energy. That is, when the amount set in the forward dose setting is too large, the dose can be adjusted in the reverse direction to reduce the set dose, thereby achieving the effect of injection dose correction.

[0154] In this embodiment, the bias guide slope 326 and the sound-generating element guide slope 335 are inclined in the opposite direction away from the injection output end 410. The inclination of the bias guide slope 326 and the sound-generating element guide slope 335 are the same. The sound-generating element action surface 334 and the bias action surface 323 are arranged in a vertical plane.

[0155] Of course, the bias guide slope 326, the sound-generating guide slope 335, the sound-generating action surface 334, and the bias action surface 323 are not limited to these. Their shapes and sizes can be set according to actual needs, as long as they can meet their functional requirements.

[0156] Further optimized, the biasing device 32 is provided with a first biasing protrusion 327 and a second biasing protrusion 328. The biasing action surface 323 is provided on one side of the first biasing protrusion 327, and the other side of the first biasing protrusion 327 is formed as a biasing stop 322. The biasing guide slope 326 is formed on the second biasing protrusion 328. The sound-emitting element is provided with a first sound-emitting element groove 336 for the first biasing protrusion 327 to be movably embedded in and a second sound-emitting element groove 337 for the second biasing protrusion 328 to be embedded in. The groove sidewall of the first sound-emitting element groove 336 opposite to the biasing action surface 323 is formed as the sound-emitting element action surface 328. 34. The groove sidewall of the first sound-emitting element groove 336 opposite to the offset stop 322 is formed as the sound-emitting element stop 333, and the groove wall of the second sound-emitting element groove 337 corresponding to the offset guide slope 326 is formed as the sound-emitting element guide slope 335. When the sound-emitting element working surface 334 and the offset working surface 323 are in contact, there is a gap between the offset stop 322 and the sound-emitting element stop 333. When the biaser 32 is in the first working position and rotates in the opposite direction, and pushes the sound-emitting element guide slope 335 with the offset guide slope 326, when the offset stop 322 and the sound-emitting element stop 333 are in contact, the sound-emitting element and the positioning element 15 are separated. During dosage setting, the bias device 32 is in the first working position. When the torsion member 13 is rotated in the reverse direction, the torsion member 13 drives the bias device 32 to rotate in the reverse direction. During the reverse rotation of the bias device 32, the bias guide ramp 326 of the bias device 32 pushes against the sound-generating member guide ramp 335. The sound-generating member has a tendency to move in two directions: reverse rotation and movement towards the injection output end 410. However, the ramp teeth 331 of the sound-generating member are engaged with the one-way teeth 151 at this time, and the reverse rotation is blocked by the positioning member 15. The sound-generating member can only move towards the injection output end 410. At this time, the sound-generating member generates displacement towards the injection output end 410, which compresses the elastic reset member 34. When the bias device 32 rotates in the reverse direction to the bias stop position... When 322 is engaged with the stop position 333 of the sound-emitting component, the sound-emitting component moves until the inclined tooth 331 and the one-way tooth 151 are completely disengaged. At this time, the sound-emitting component disengages from the positioning component 15. Since the sound-emitting component loses the positioning function of the positioning component 15, it begins to rotate in the opposite direction under the elastic torque of the torsional elastic element 36. The bias guide inclined surface 326 of the biaser 32 disengages from the sound-emitting component guide inclined surface 335 of the sound-emitting component. There is an axial gap between the biaser 32 and the sound-emitting component. The elastic reset component 34 pushes the sound-emitting component to move toward the positioning component 15. The sound-emitting component and the positioning component 15 return to the meshing state. In this embodiment, the sound-emitting component rotates in the opposite direction relative to the positioning component 15 by a distance of one one-way tooth 151 each time. After the rotation, the two continue to mesh.Each time the sound-generating component rotates one tooth, it separates from the positioning component 15 once, and then the two re-engage. This achieves the reverse setting of the dosage in the above manner. When the torsion component 13 rotates in the forward direction, it generates the injection driving energy, and when the torsion component 13 rotates in the reverse direction, it releases the injection driving energy to reduce the set dosage and achieve the effect of injection dosage correction.

[0157] The biasing device 32 has at least two first biasing protrusions 327 and at least two second biasing protrusions 328 arranged alternately and at intervals along its circumference on its outer side wall. The sound-emitting element has at least two first sound-emitting element grooves 336 corresponding to the at least two first biasing protrusions 327 and at least two second sound-emitting element grooves 337 corresponding to the at least two second biasing protrusions 328, respectively.

[0158] In this embodiment, the first bias protrusion 327 is rectangular, and there are two of both the first bias protrusion 327 and the second bias protrusion 328.

[0159] The shape and number of the first biased protrusion 327 and the second biased protrusion 328 can be set according to actual needs. The first sound-emitting element groove 336 and the second sound-emitting element groove 337 are correspondingly provided.

[0160] Specifically, the biasing device 32 includes a biasing main cylinder, with a first biasing protrusion 327 and a second biasing protrusion 328 formed on the outer wall of the biasing main cylinder. The flange 325 is located on the side of the first biasing protrusion 327 and the second biasing protrusion 328 away from the injection output end 410. The sound-generating element includes a sound-generating element main cylinder, with the first sound-generating element groove 336 and the second sound-generating element groove 337 correspondingly located on the inner side of the sound-generating element main cylinder. The inclined tooth 331 is located at the end of the sound-generating element main cylinder away from the injection output end 410, thus facilitating processing. The rotating element 35 is provided with a stroke groove extending along its axial direction, and the sound-generating element is provided with an anti-disengagement hook that movably engages with the stroke groove. When the sound-generating element moves relative to the rotating element 35, the anti-disengagement hook moves along the stroke groove. The groove wall at the end of the stroke groove away from the injection output end 410 can act as a limit, preventing the anti-disengagement hook from disengaging, thereby preventing the sound-generating element from separating from the rotating element 35.

[0161] Specifically, when the biasing joint 324 engages with the first joint 134, the torsion member 13 and the biaser 32 rotate synchronously in cooperation; when the biasing joint 324 engages with the second joint 211, the biaser 32 and the piston rod unit rotate synchronously in cooperation.

[0162] In this embodiment, the biased engagement portion 324 includes a first biased insert and a second biased insert 802. The first engagement portion 134 includes a plurality of first engagement slots for the first biased inserts to be inserted into the first engagement slots respectively. The second engagement portion 211 includes a plurality of mating inserts 803 arranged in a circumferentially spaced manner. A second engagement slot 804 for the second biased insert 802 to be inserted is formed between any two adjacent mating inserts 803. Thus, when the first biased insert is inserted into the plurality of first engagement slots of the first engagement portion 134, the biaser 32 is rotated into the torsion member 13. When the biased engagement portion 325 engages with the second engagement portion 211, the second biased insert 802 is inserted into the second engagement slot 804. The biaser 32 is rotated into the piston rod unit synchronously.

[0163] Of course, in addition to these, the bias joint 324, the first joint 134, and the second joint 211 can also adopt other structures. For example, the bias joint 324 can be a plurality of bias slots arranged in a circle, and the first joint 134 and the second joint 211 can each include a plurality of engagement teeth for being respectively inserted into the plurality of bias slots, which can also realize the synchronous rotational engagement of the biaser 32 with the torsion member 13 and the piston rod unit.

[0164] The piston rod unit includes a linkage 21 and a piston rod 22. The linkage 21 is rotatably mounted in the support member 40, and the second joint 211 is disposed on the linkage 21. When the linkage 21 rotates, the piston rod 22 is used to generate axial displacement.

[0165] The piston rod unit also includes a piston 24. The piston rod 22 is threadedly connected to the support member 40. The piston rod 22 rotates synchronously with the linkage member 21 and can move relative to the linkage member 21. The piston 24 is mounted on the piston rod 22. When the offset device 32 drives the linkage member 21 to rotate, the piston rod 22 rotates under the drive of the linkage member 21 and spirals forward under the action of the thread of the support member 40, thus allowing the piston to push the injection. The inner circumference of the support member 40 is provided with multiple unidirectional sound-emitting teeth. The linkage member 21 is provided with an elastic arm 212, and the elastic arm 212 is provided with mating sound-emitting teeth 213 that mesh with the unidirectional sound-emitting teeth. When the linkage member 21 rotates, the mating sound-emitting teeth 213 slide and collide with the unidirectional sound-emitting teeth in sequence to generate sound, which can play the role of pushing the injection and generating sound.

[0166] Of course, in addition to the above-described structure, the linkage 21 and piston rod 22 can also adopt other structures, as long as the piston rod 22 can undergo axial displacement when the linkage 21 rotates. For example, the piston rod 22 can be threadedly connected to the linkage 21, and the piston rod 22 can be relatively movable with the support member 40, so that when the linkage 21 rotates, the piston rod 22 undergoes helical motion, generating axial displacement, and performing drug injection.

[0167] The injection assembly also includes a graduated ring 37, which is movably mounted on the rotating member 35 and threadedly connected to the support member 40. A window is provided on the support member 40 corresponding to the graduated ring 37. When the rotating member 35 rotates, the graduated ring 37 is guided by the thread of the support member 40 to move in a spiral motion under the action of the rotating member 35. The window on the support member 40 allows observation of the set scale value (not shown) on the graduated ring 37. The support member 40 is provided with an initial stop and a stop 415, which are sequentially arranged along the direction away from the injection output end 410. In the initial state, the graduated ring 37 is engaged with the initial stop, preventing the graduated ring 37, rotating member 35, and sound-emitting member 33 from rotating in the opposite direction. During dose setting, the graduated ring 37 moves to the stop 415 and engages, preventing the dose value from being increased, thus improving safety.

[0168] The torsion member 13 includes a pressure cap 136 and a central column 137 disposed on the pressure cap 136. The pressure cap 136 is rotatably mounted on the support member 40. The first joint 134 is disposed on the central column 137. The central column 137 is located on the side of the linkage 21 away from the injection output end 410. The biasing device 32 can slide axially onto the central column 137 and the linkage 21 to be movable to a first working position and a second working position.

[0169] In this embodiment, the piston rod unit passes through the inner side of the rotating member 35, and the central column 137 passes through the inner side of the positioning member 15.

[0170] The support member 40 may include a housing, a torsion spring seat 38 disposed within the housing, a fixed seat 31 disposed within the housing, and a guide seat 23 disposed within the housing; the support joint may be formed on the fixed seat 31, the torsional elastic element 36 is connected to the torsion spring seat 38, and a one-way sound-emitting tooth is disposed on the torsion spring seat 38; the piston rod is threadedly connected to the guide seat 23.

[0171] Of course, in addition to this, the support member 40 can also be set according to actual needs, but the most preferred embodiment of the present invention is to use a combination of a shell, a torsion spring seat 38 and a fixing seat 31 for the support member 40, which is convenient for processing.

[0172] The actual dosage setting process of the injection component of the present invention is as follows: the torsion member 13 is rotated, and the torsion member 13 is engaged with the biasing engagement 324 of the biaser 32 through the first engagement 134, so that the biaser 32, the sound-emitting member 33, the rotating member 35 and the scale ring 37 are rotated by the torsion member 13. The scale ring 37 is guided by the thread of the support member 40 to move spirally. One end of the torsional elastic element 36 is connected to the rotating member 35, and the other end is fixed by the support member 40. When the rotating member 35 rotates in the forward direction, it drives the torsional elastic element 36 to twist and generate injection driving energy.

[0173] The actual injection process of the injection assembly of the present invention is as follows: Press the pressing member 11, and the pressing member 11 pushes the pad 14, the positioning member 15, the biasing device 32, and the sound-emitting device 33 to move toward the injection output end 410. The biasing engagement portion 324 of the biasing device 32 engages with the second engagement portion 211 of the piston rod unit. The biasing engagement portion 324 of the biasing device 32 disengages from the first engagement portion 134 of the torsion member 13. Continue to press the pressing member 11 until the third engagement portion 152 of the positioning member 15 disengages from the fixed seat 31. At this time, the torsion elastic element 36 releases the injection driving energy, which drives the rotating member 35, the scale ring 37, the sound-emitting device 33, the biasing device 32, the positioning member 15, the linkage member 21, and the piston rod 22 to rotate. The scale ring 37 is moved and reset by the threaded guide of the support member 40, and the piston rod 22 is moved by the threaded guide of the support member 40 to perform the injection operation.

[0174] As shown in Figures 1-3, the present invention also discloses an injection device, including a dose accumulation component and the above-mentioned injection component. The dose accumulation component is disposed between the torsion member 13 and the support member 40. A drug storage unit 60 is disposed on the support member 40, and the piston rod unit is used to push the drug liquid in the drug storage unit 60 toward the injection output end 410.

[0175] In this embodiment, the injection output end 410 may be equipped with an injection needle 70. The drug storage unit 60 includes a drug reservoir and a drug bottle 50 disposed within the drug reservoir. Of course, the drug storage unit 60 can also be configured in other ways, as long as it can store drugs.

[0176] Specifically, the dose accumulation component includes a worm gear 12 rotatably mounted on the torsion member 13 and a spiral track 416 disposed on the support member 40, wherein the worm gear 12 meshes with the spiral track 416. During dose setting, the torsion member 13 is rotated, and the worm gear 12 rotates under the drive of the torsion member 13 and the spiral track 416. Thus, the total number of rotations of the worm gear 12 reflects the total number of rotations of the torsion member 13 for all injections. The worm gear 12 is also provided with a worm gear 12 stop. In this embodiment, the torsion member 13 drives the worm gear 12 to rotate. One rotation of the torsion member 13 corresponds to one tooth rotation of the worm gear 12. When the dose reaches the maximum value, the torsion member 13 engages with the worm gear 12 stop and cannot rotate. At this time, dose setting cannot be performed. Therefore, the dose accumulation component can limit the total maximum injection volume for all injections, ensuring safety during use.

[0177] As a further preferred embodiment of the present invention, as shown in Figures 19 to 25, the injection assembly further includes a compensating transmission structure, which can cause the piston rod unit to rotate when the biaser 32 moves toward the second working position.

[0178] In this embodiment, when the biasing device 32 moves toward the second working position, the linkage 21 is rotated by a compensating transmission structure. The biasing engagement portion 324 is provided with a pushing surface 801; the compensating transmission structure includes the pushing surface 801. When the biasing device 32 moves toward the second working position, the pushing surface 801 pushes against the second engagement portion 211 to rotate the linkage 21; when the biasing engagement portion 324 engages with the second engagement portion 211 and the biasing device 32 rotates, the biasing engagement portion 324 pushes against the second engagement portion 211 to rotate the linkage 21. During the movement of the biasing device 32 toward the second working position direction P, the pushing surface 801 can push the second engagement portion 211 to rotate the linkage 21. As the biasing device 32 moves to the second working position, the biasing engagement portion 324 engages with the second engagement portion 211. When the biasing device 32 rotates, the biasing engagement portion 324 can push the second engagement portion 211 to rotate the linkage 21. Therefore, in addition to using the biasing engagement portion 324 to push the second engagement portion 211, the rotational movement of the biasing device 32 can also be directed to the linkage 21. In addition to rotating the linkage 21 by transmitting force, the linkage 21 can also be rotated by moving the bias device 32 and using the push surface 801 to push the second joint 211, thereby increasing the rotation angle of the linkage 21 and compensating for the rotation amplitude of the linkage 21. This can improve the problem of insufficient rotation amplitude of the linkage 21 caused by manufacturing errors, assembly errors and movement gaps of parts, and thus improve the problem of insufficient injection dosage caused by insufficient rotation amplitude of the linkage 21. Moreover, this injection assembly is simple and easy to manufacture, which is conducive to mass production.

[0179] The second joint 211 is provided with a mating surface 805 that matches the pushing surface 801. The mating surface 805 is used for the pushing surface 801 to push against it. When the biasing device 32 is moving towards the second working position, the pushing surface 801 can be used to push against the mating surface 805 of the second joint 211 to rotate the linkage 21. In this embodiment, the pushing surface 801 can be set as an inclined surface, and the mating surface 805 is also set as an inclined surface that matches the inclination of the pushing surface 801. During the movement of the biasing device 32 relative to the linkage 21 towards the second working position, the pushing surface 801 can be used to push against the mating surface 805, causing the mating surface 805 to slide under the pushing action of the pushing surface 801, thereby rotating the linkage 21.

[0180] In this embodiment, the pushing surface 801 is inclined along the circumferential direction from its upper end to its lower end. Of course, in addition to setting the pushing surface 801 and the mating surface 805 as inclined surfaces, the pushing surface 801 and the mating surface 805 can also be set as other structures, as long as the pushing surface 801 can be used to push the second joint 211 to make the linkage 21 rotate during the movement of the biaser 32 toward the second working position. For example, the pushing surface 801 and the mating surface 805 can also be set as arc surfaces, etc.

[0181] In this embodiment, the pushing surface 801 is disposed at the lower end of the second biasing tooth 802, and the mating surface 805 is disposed at the upper end of the mating tooth 803. When the biasing engagement portion 324 engages with the second engagement portion 211 and the biaser 32 rotates, the tooth sidewall of the second biasing tooth 802 is used to push against the tooth sidewall of the mating tooth 803 to rotate the linkage 21. During operation, as the biaser 32 moves to the second working position, the biasing engagement portion 324 engages with the second engagement portion 211, and the second biasing tooth 802 is inserted into the second engagement slot 804. When the biaser 32 rotates, the tooth sidewall of the second biasing tooth 802 can be used to push against the tooth sidewall of the mating tooth 803 to rotate the linkage 21.

[0182] By providing a pushing surface 801 on the biased joint 324, dosage compensation can be performed during the drug injection process, specifically as follows: Pressing the pressing member 11 causes the biasing device 32 to move axially downward toward the second working position, and the biased joint 324 to move in direction P toward the second joint 211. The pushing surface 801 of the biasing device 32 contacts the mating surface 805 of the linkage member 21 (as shown in Figure 22). As the biasing device 32 continues to move downward, the pushing surface 801 of the biasing device 32 slides against the mating surface 805 of the linkage member 21 (as shown in Figure 23), pushing the linkage member 21 to rotate in the opposite direction by an angle A. The piston rod 22 is axially displaced under the action of the linkage member 21 to perform drug injection, thereby achieving dosage compensation. In this embodiment, the rotation angle A of the linkage member 21 corresponds to all the cumulative errors in the transmission from the sound-generating member 33 to the linkage member 21. As the biasing device 32 continues to move downward, the pushing surface 801 of the biasing device 32 slides away from the mating surface 805 of the linkage 21, and the biasing engagement portion 324 of the biasing device 32 fully engages with the second engagement portion 211 of the linkage 21 (as shown in Figure 24). The energy stored in the torsional elastic element 36 is released, and the rotating element 35 and the sound-emitting element 33 are driven to rotate in the opposite direction through the torsional elastic element 36. The sound-emitting element 33 drives the biasing device 32 to rotate, and the biasing device 32 drives the linkage 21 to rotate in the opposite direction. At this time, the piston rod 22 undergoes axial displacement by spiraling motion, and the drug is injected.

[0183] Secondly, referring to Figures 25 to 39, the following embodiments of this application disclose a syringe reset mechanism and transmission device. The syringe reset mechanism includes a linkage component 1004 and a transmission component 1003.

[0184] The linkage component 1004 (which is also an offset device) is provided with a top abutment 1041;

[0185] The transmission component 1003 (which is also a sound-generating component) is provided with an elastic reset part 1031. The elastic reset part 1031 is used to abut against the top part 1041.

[0186] The elastic reset part 1031 is used to engage with the abutting top 1041 in the following manner: when the transmission member 1003 is restricted to rotate in the first direction, when the linkage member 1004 rotates in the first direction A, causing relative movement between the transmission member 1003 and the linkage member 1004, so that the elastic reset part 1031 is deformed by the abutting top 1041 (as shown in Figures 28 and 29), the elastic reset part 1031 generates reset energy to cause the linkage member 1004 to rotate in the second direction B when it is released from the linkage member 1004; the first direction is opposite to the second direction.

[0187] In this embodiment, the syringe increases the set dose during forward adjustment and decreases the set dose during dose setting reversal. The direction in which the syringe decreases the set dose is the dose setting reversal direction. The first direction is the dose setting reversal direction. In this embodiment, the first direction is counterclockwise, meaning the dose setting reversal direction is counterclockwise, and the second direction is clockwise. Of course, the first and second directions are not limited to these and can be set according to actual needs.

[0188] When the dose setting is reset, the syringe's energy storage device 1001 releases energy to reduce the set dose. When the syringe's energy storage is reset to the corresponding zero-scale set dose, the energy storage device 1001 can no longer release energy and cannot rotate in the direction of dose setting reset (i.e., it cannot rotate in the first direction). The transmission member 1003 connected to the energy storage device 1001 also cannot rotate in the first direction (i.e., the transmission member 1003 is restricted from rotating in the first direction).

[0189] When the syringe's energy storage corresponds to the zero-scale set dosage, the linkage member 1004 rotates along the first direction under the action of an externally applied return force. Since the transmission member 1003 is restricted from rotating along the first direction, relative movement occurs between the transmission member 1003 and the linkage member 1004, causing the elastic reset part 1031 to deform against the abutment 1041, thereby generating reset energy. After the externally applied return force is removed, the elastic reset part 1031 elastically recovers and releases the reset energy to the abutment 1041, thus utilizing the reset... Energy drives the linkage component 1004 to rotate in the second direction, causing the linkage component 1004 to move toward the corresponding zero-scale dose position. Since the reset energy generated by the elastic deformation of the elastic reset part 1031 acts directly on the linkage component 1004 without the need for transmission through intermediate parts, it helps the linkage component 1004 to reset quickly. Moreover, the cooperation between the elastic reset part 1031 of the transmission component 1003 and the abutment 1041 of the linkage component 1004 helps the linkage component 1004 to reset quickly, making its structure simpler and easier to manufacture.

[0190] The syringe reset mechanism also includes an elastic element 1002; when the transmission member 1003 is restricted to rotate in the first direction, when the linkage member 1004 rotates in the first direction, causing relative movement between the transmission member 1003 and the linkage member 1004, and the elastic element 1002 is compressed by the transmission member 1003, the elastic element 1002 generates driving energy that acts on the linkage member 1004 through the transmission member 1003 when released, causing the linkage member 1004 to rotate in the second direction. When the syringe's stored energy is at the corresponding zero-scale set dose, the linkage component 1004 rotates along the first direction under the action of an externally applied return force. Since the syringe's stored energy is at the corresponding zero-scale set dose, the transmission component 1003 cannot rotate along the first direction (i.e., the transmission component 1003 is restricted from rotating along the first direction). At this time, relative movement occurs between the transmission component 1003 and the linkage component 1004, causing the elastic element 1002 to be compressed by the transmission component 1003, and the elastic reset part 1031 to deform under the pressure of the top part 1041. The compression of the elastic element 1002 generates driving energy, and the deformation of the elastic reset part 1031 generates reset energy. After the externally applied return force is removed, the elastic element 1002 elastically resets, and the elastic element 1002... The driving energy of 002 acts on the linkage component 1004 through the transmission component 1003. The elastic reset part 1031 elastically restores itself and releases reset energy to the abutment top 1041 against which it abuts. Under the combined action of the driving energy and the reset energy, the linkage component 1004 rotates in the second direction and can quickly reset to the corresponding zero-scale dose position. Therefore, based on the abutment top 1041 of the linkage component 1004 and the elastic reset part 1031 of the transmission component 1003, combined with the elastic element 1002, the elastic reset part 1031 and the elastic element 1002 can play a dual driving role, further improving the timeliness of the reset of the linkage component 1004. This allows the linkage component 1004 to quickly respond and reset after the zero set dose is returned, thus improving the reliability of the product.

[0191] The elastic element 1002 can be a spring, elastic strip, or anything else that can perform the corresponding function.

[0192] Preferably, the transmission component 1003 and the linkage component 1004 form a pushing fit structure.

[0193] In this embodiment, as shown in Figures 29-33, the pushing and engaging structure includes a first pushing inclined surface 1043 disposed on the linkage member 1004 and a second pushing inclined surface 1032 disposed on the transmission member 1003; the two ends of the first pushing inclined surface 1043 are offset in the circumferential direction of the linkage member 1004; the second pushing inclined surface 1032 is used to slide and engage with the first pushing inclined surface 1043. When the syringe's stored energy is at the zero-scale set dose, the linkage member 1004 rotates along the first direction under the action of an externally applied return force. Since the syringe's stored energy is at the zero-scale set dose, the transmission member 1003 is restricted from rotating along the first direction. The transmission member 1003 is pushed downwards by the interaction of the first pushing inclined surface 1043 and the second pushing inclined surface 1032, compressing the elastic member 1002. Simultaneously, because the linkage member 1004 rotates relative to the transmission member 1003 along the first direction, the abutment 1041 of the linkage member 1004 abuts against and compresses the elastic reset part 1031 of the transmission member 1003, forcing the elastic reset part 1031 of the transmission member 1003 to deform and generate reset energy. After the externally applied return force is removed, the compressed elastic member 1002 returns to its original state, and the generated driving energy is used for… The transmission member 1003, through its second pushing inclined surface 1032 abutting against the first pushing inclined surface 1043 of the linkage member 1004, can push the linkage member 1004 to rotate in the second direction. In this way, the driving energy generated by the elastic member 1002 can be applied to the linkage member 1004 through the transmission member 1003 to drive the linkage member 1004 to rotate in the second direction. At the same time, the elastic reset part 1031 of the transmission member 1003 elastically recovers, and the reset energy generated by the elastic reset part 1031 is released to the linkage member 1004 and acts on the abutting top 1041 of the linkage member 1004, driving the linkage member 1004 to rotate in the second direction. Therefore, the linkage member 1004 can rotate in the second direction under the combined action of driving energy and reset energy, and can quickly reset to the corresponding zero-scale dose position.

[0194] Of course, the aforementioned push-fit structure is not limited to this and can be set according to actual needs.

[0195] The syringe's reset mechanism also includes a base 1006, which has a limiting part 1061 for the linkage member 1004 to abut against. When the syringe's stored energy is at the zero-scale set dose, the linkage member 1004 rotates along a first direction under the action of an externally applied return force. The elastic element 1002 is compressed, generating driving energy, and the elastic reset part 1031 is deformed, generating reset energy. After the externally applied return force is removed, the driving energy generated by the compression of the elastic element 1002 acts on the transmission member 1003. Since the first pushing inclined surface 1043 of the linkage member 1004 abuts against the second pushing inclined surface 1032 of the transmission member 1003, this driving energy exerts a force on the linkage member 1004 through the transmission member 1003, normal to the first pushing inclined surface 1043. When component 1004 moves upward against the limiting part 1061, it is blocked by the limiting part 1061 of the base 1006. Its component force pushes the linkage component 1004 to rotate in the second direction. At the same time, the reset energy of the elastic reset part 1031 acts on the top 1041 of the linkage component 1004. Through this reset energy transmission component 1003, there is a force normal to the top 1041 of the linkage component 1004. Because the linkage component 1004 moves upward against the limiting part 1061 and is blocked by the limiting part 1061 of the base 1006, its component force pushes the linkage component 1004 to rotate in the second direction, so that the linkage component 1004 can quickly reset to the corresponding zero-scale dose position.

[0196] The external force for reversal can be applied directly or indirectly to the linkage member 1004. In this embodiment, the base 1006 is configured as a torsion member that can rotate synchronously with the linkage member 1004. When the syringe's stored energy is used to perform dose setting reversal at the corresponding zero-scale set dose, the user can apply a reversal force to the torsion member to make it rotate along the dose setting reversal direction, and drive the linkage member 1004 to rotate along the first direction through the torsion member, thereby transmitting the reversal force to the linkage member 1004.

[0197] The top abutment 1041 is an inclined abutment surface, and the two ends of the inclined abutment surface are staggered in the circumferential direction of the linkage component 1004; the elastic reset part 1031 is a cantilever.

[0198] Of course, in addition to setting the top abutment 1041 as abutment slope and the elastic reset part 1031 as cantilever, the top abutment 1041 and the elastic reset part 1031 can also be set as other according to actual needs.

[0199] The linkage member 1004 is provided with a first limiting surface 1042, and the transmission member 1003 is provided with a second limiting surface 1033 for the first limiting surface 1042 to abut against. When the transmission member 1003 is restricted to rotate in the first direction, the linkage member 1004 rotates in the first direction. When the first limiting surface 1042 abuts against the second limiting surface 1033, the linkage member 1004 cannot continue to rotate. Therefore, by using the first limiting surface 1042 and the second limiting surface 1033, the maximum rotatable angle of the linkage member 1004 is limited.

[0200] As shown in Figures 25-39, the present invention also discloses a transmission device, which includes an energy storage device 1001, a functional collar 1005, a support member 1007, and the aforementioned syringe reset mechanism. A transmission structure for transmission between the energy storage device 1001 and the transmission member 1003 is formed between the energy storage device 1001 and the transmission member 1003. The functional collar 1005 rotates synchronously with the energy storage device 1001 and can move relative to the energy storage device 1001. A first stop position 1051 is provided on the functional collar 1005, and a second stop position 1071 is provided on the support member 1007 for the first stop position 1051 to abut against. When the first stop position 1051 abuts against the second stop position 1071, the transmission member 1003 is restricted to rotate in a first direction. When the energy storage of the syringe is set to the corresponding zero-scale dose, the energy storage device 1001 can no longer release energy. The first stop 1051 and the second stop 1071 of the functional collar 1005 abut against each other. Through the limiting effect of the second stop 1071 on the first stop 1051, the rotation of the functional collar 1005 in the first direction is restricted, so that neither the energy storage device 1001 nor the transmission member 1003 can rotate in the first direction. That is, the transmission member 1003 is restricted to rotate in the first direction.

[0201] The transmission structure includes a transmission groove and a transmission protrusion for movably embedding within the transmission groove. One of the transmission groove and the transmission protrusion is disposed on the energy storage device 1001, and the other is disposed on the transmission member 1003, so that when the transmission protrusion is embedded in the transmission groove, rotational motion can be transmitted between the energy storage device 1001 and the transmission member 1003, and axial movement can occur. Of course, other structures can also be used for transmission between the energy storage device 1001 and the transmission member 1003, as long as they are suitable for transmission between the energy storage device 1001 and the transmission member 1003.

[0202] In this embodiment, the elastic element 1002 is disposed between the transmission member 1003 and the energy storage device 1001. Of course, the position of the elastic element 1002 is not limited to this, as long as it can play a corresponding elastic role.

[0203] The energy storage device 1001 includes a scale rod 1011 and a torsion spring 1012. The torsion spring 1012 is disposed between the scale rod 1011 and the support member 1007. The transmission structure is formed between the scale rod 1011 and the transmission member 1003. The functional collar 1005 rotates synchronously with the scale rod 1011 and can move relative to the scale rod 1011. The functional collar 1005 is a scale ring threadedly connected to the support member 1007. Specifically, the elastic element 1002 is disposed between the transmission member 1003 and the scale rod 1011 of the energy storage device 1001. During dose setting adjustment, the scale lever 1011 rotates in the second direction, storing energy through the rotation of the torsion spring 1012. Since the energy stored in the torsion spring 1012 serves as the injection power, the set dose can be increased. The functional collar 1005 rotates along the scale lever 1011 in the second direction and moves relative to the scale lever 1011. As the stored energy increases, the functional collar 1005 moves to the position of the syringe arrow corresponding to the larger set dose scale value, allowing the user to understand the currently set dose. During dose setting reversal, the scale lever 1011 rotates in the first direction, and the torsion spring 1012 rotates accordingly to release energy, decreasing the set dose. As the stored energy decreases, the functional collar 1005 moves to the position of the syringe arrow corresponding to the smaller set dose scale value.

[0204] In addition to the above, the energy storage device 1001 can also be other existing energy storage devices on the market, as long as they can play the role of storing and releasing energy. However, using a scale rod 1011 and a torsion spring 1012 for the energy storage device 1001 is the most preferred embodiment of the present invention, which can facilitate installation.

[0205] The transmission device further includes a ratchet 1008, and the transmission member 1003 is provided with one-way teeth for meshing with the ratchet 1008; when the linkage member 1004 rotates relative to the transmission member 1003 in a first direction, the transmission member 1003 is displaced relative to the ratchet 1008 so that the transmission member 1003 separates from the ratchet 1008; the elastic member 1002 is used to cause the transmission member 1003 to mesh with the ratchet 1008; the transmission member 1003 is provided with a first positive rotational pushing surface 1034, and the linkage member 1004 is provided with a second positive rotational pushing surface 1044 corresponding to the first positive rotational pushing surface 1034. During the dose setting adjustment, the linkage component 1004 rotates in the second direction under the action of the external adjustment force applied by the outside. The second positive rotational pushing surface 1044 of the linkage component 1004 pushes against the first positive rotational pushing surface 1034, which can cause the transmission component 1003 and the energy storage device 1001 to rotate in the second direction, so that the energy storage device 1001 stores energy and increases the set dose. When the dosage setting is adjusted back, the linkage component 1004 rotates in the first direction under the action of the external adjustment force applied by the outside. Since the rotation of the transmission component 1003 in the first direction is blocked by the ratchet 1008, the first pushing inclined surface 1043 of the linkage component 1004 pushes the second pushing inclined surface 1032 of the transmission component 1003, causing the transmission component 1003 to move downward and separate from the ratchet 1008 (as shown in Figure 28). At this time, the ratchet 1008 loses its blocking and limiting effect on the transmission component 1003, the energy storage device 1001 releases energy, and the transmission component 1003 rotates in the first direction along with the energy storage device 1001. Then, the transmission component 1003 is reset to engage with the ratchet 1008 under the action of the elastic force of the elastic element 1002. In this way, the dosage adjustment can be realized, the set dosage is reduced, and the injection dosage correction effect is achieved. During the dose setting and reversal process, the functional collar 1005 rotates along the first direction and moves relative to the energy storage device 1001. When the functional collar 1005 moves to the point where the first stop 1051 and the second stop 1071 abut, the syringe's stored energy corresponds to the zero-scale set dose, and the energy storage device 1001 can no longer release energy. The second stop 1071 limits the first stop 1051, thus restricting the rotation of the functional collar 1005 and the energy storage device 1001 along the first direction. By cooperating with the transmission component 1003, the energy storage device 1001, and the ratchet 1008, the dose setting can be adjusted and reversed.

[0206] In this embodiment, the transmission component 1003 is movably mounted on the outside of the linkage component 1004. The second limiting surface 1033, the elastic reset part 1031, the second pushing inclined surface 1032, and the first forward rotating pushing surface 1034 are all disposed on the inner side of the transmission component 1003, while the first pushing inclined surface 1043, the second forward rotating pushing surface 1044, the first limiting surface 1042, and the top abutment 1041 are all disposed on the outer side of the linkage component 1004.

[0207] As shown in Figures 34-39, the transmission device further includes a rotating component 1009. One of the linkage component 1004 and the rotating component 1009 is provided with a first tooth unit, and the other is provided with a second tooth unit. The linkage component 1004 and the rotating component 1009 transmit rotational motion through the engaging first tooth unit and the second tooth unit. The first tooth unit includes a plurality of first mating teeth 1045 arranged in a circle. The second tooth unit includes a plurality of tooth sub-units arranged in a circle. The interval C between any two adjacent tooth sub-units is greater than the interval between any two adjacent first mating teeth 1045. The tooth sub-unit includes a plurality of second mating teeth 1092, and a tooth groove for the second mating teeth 1092 to be inserted is formed between any two adjacent first mating teeth 1045. When it is necessary to transmit rotational motion between the linkage component 1004 and the rotating component 1009, the first tooth unit and the second tooth unit need to engage. By including a number of tooth sub-units arranged in a circle in the second tooth unit, and making the interval between any two adjacent tooth sub-units larger than the interval between any two adjacent first mating teeth 1045, the number of second mating teeth 1092 can be reduced, thereby reducing the contact surface when the first mating teeth 1045 and the second mating teeth 1092 engage and disengage, and reducing friction.

[0208] Preferably, in the same toothed subunit, at least one second mating tooth 1092 has a height less than the height of the other second mating teeth 1092. This is so that when the first toothed unit and the second toothed unit begin to engage, the first mating tooth 1045 contacts the higher second mating tooth 1092, while the lower second mating teeth 1092 are left unattended, further reducing the contact surface during engagement and thus reducing friction. After full engagement, all the second mating teeth 1092 engage with the first mating tooth 1045, improving the connection strength and preventing tooth breakage.

[0209] In this embodiment, the height of the second mating teeth 1092 at both ends of the toothed subunit is greater than the height of the second mating teeth 1092 in the middle.

[0210] The ends of the second mating tooth 1092 that engage with the first mating tooth 1045 are provided with rounded corners 1097. Specifically, the first mating tooth 1045 and the second mating tooth 1092 have rounded corners 1097 at their circumferential tops, so that when the teeth are initially engaged, they are in point contact and cannot form support, allowing them to slide against each other and preventing jamming that could cause abnormal engagement. The first mating tooth 1045 and the second mating tooth 1092 have arc features 1096 at their axial tops, so that when the teeth are initially engaged, they are in point contact and cannot form support, preventing jamming that could cause abnormal meshing.

[0211] Preferably, the first mating tooth 1045 is larger at the top and smaller at the bottom, and has a guide slope 1098. The shape of the second mating tooth 1092 matches that of the first mating tooth 1045, so that it is easy to guide when the engagement begins, and the engagement process is smooth and stable.

[0212] The rotating component 1009 may be a piston drive rod or a push assembly, so that when the first gear unit and the second gear unit are engaged, the energy released by the energy storage device 1001 can be transmitted to the transmission component 1003 and then transmitted to the rotating component 1009 via the linkage component 1004, thereby providing kinetic energy to the rotating component 1009.

[0213] Thirdly, referring to Figures 40 to 47, the following embodiments of this application disclose a transmission mechanism and an injection device. Specifically referring to Figures 40, 42, 44, and 47, the transmission mechanism includes:

[0214] Actuator 2002, drive sleeve 2032 and transmission assembly 2004;

[0215] The transmission assembly 2004 is connected to the drive sleeve 2032 via a circumferential guiding structure;

[0216] When the actuator 2002 is pressed, the transmission assembly 2004 can generate a circumferential displacement relative to the drive sleeve 2032 under the thrust of the actuator 2002 by means of the circumferential guiding structure.

[0217] Specifically, the actuator 2002 can be a button or other press-release component. The drive sleeve 2032 is fixed to the power source of the injection device. After the actuator 2002 is pressed to release the power source, the drive sleeve 2032 can be directly driven to rotate by the power source.

[0218] The transmission assembly 2004 can be a single cylindrical component or a combination of multiple cylindrical components.

[0219] Compared with the prior art, the transmission mechanism and injection device provided in the embodiments of the present invention have the following advantages:

[0220] It operates stably and reliably, and can improve energy transfer efficiency. When the user presses the actuator to inject, the transmission mechanism 4 can convert the force of the user pressing the actuator 2002 into the circumferential displacement of the transmission component 2004 relative to the drive sleeve 2032. This circumferential displacement compensates for the problem of attenuation of the rotation angle of the drive sleeve 2032 transmitted to the rotating cylinder due to manufacturing errors, assembly errors and movement gaps, thereby achieving injection dose compensation.

[0221] In an optional embodiment, the circumferential guiding structure includes a lateral protrusion 2411 and a guide rail 2321, with the lateral protrusion 2411 embedded within the guide rail 2321. Furthermore, the guide rail 2321 can be designed to be closed at both ends, thereby preventing the lateral protrusion 2411 from dislodging during circumferential displacement relative to the guide rail 2321.

[0222] In one specific embodiment, as shown in FIG47, the lateral protrusion 2411 is disposed on the transmission assembly 2004, and the guide rail 2321 is disposed on the drive sleeve 2032. In other specific embodiments, the lateral protrusion 2411 may also be disposed on the drive sleeve 2032, while the guide rail 2321 may be disposed on the transmission assembly 2004.

[0223] In an optional embodiment, the guide rail 2321 includes a sloping groove section with its two ends offset in the circumferential direction and a straight groove section at the far end. When the actuator 2002 is not pressed, the lateral protrusion 2411 is located in the straight groove section. When the actuator 2002 is pressed, under the guidance of the straight groove section, the transmission assembly 2004 first generates an axial displacement until the lateral protrusion 2411 enters the sloping groove section. The relative movement between the lateral protrusion 2411 and the sloping groove section in the extension direction of the sloping groove section causes the transmission assembly 2004 to generate a circumferential displacement relative to the drive sleeve 2032.

[0224] In an optional embodiment, a lateral protrusion 2411 is provided on the end of an axially extending spring arm 2412.

[0225] Specifically, during assembly, the spring arm 2412 can be bent radially inward to facilitate the assembly of the lateral protrusion 2411 into the guide rail 2321.

[0226] Referring specifically to Figures 40-47, this application also discloses an injection device, which includes: a housing assembly 2001, a dosage knob 2006, a transmission mechanism as described in the first embodiment and any optional embodiment of the first embodiment, a rotary feed assembly 2005 (i.e., a piston rod unit), and a power source. The injection device of this application has the following advantages: it avoids abnormal situations of the rotary feed assembly 2005 during dosage setting, operates stably and reliably, and improves energy transfer efficiency.

[0227] For ease of description, in this embodiment and subsequent embodiments, as shown in Figure 40, "proximal end" is defined as the end closer to the needle of the injection device, and "distal end" is the end farther away from the needle of the injection device.

[0228] In addition, the power source and the drive sleeve 2032 together form the power assembly 2003, and the power source can be any power structure whose power magnitude can be set.

[0229] The user sets the dosage to be injected by rotating the dosage knob 2006. During dosage setting, the rotation of the dosage knob 2006 can set the driving force of the power component 2003. The actuator 2002, as an actuator, can trigger the release of the power component 2003 when pressed, providing power to the rotary feed component 2005.

[0230] Both the dosage knob 2006 and the actuator 2002 are located at the far end of the housing assembly 2001. The dosage knob 2006 is preferably fixed on the housing assembly 2001, the actuator 2002 is fixed inside the dosage knob 2006, and the dosage knob 2006 can rotate relative to the housing assembly 2001.

[0231] Depending on the type of power source, the injection device can be either an electronic or mechanical energy storage injection device. Taking an electronic energy storage device as an example, the power source can be a motor. The drive sleeve 2032 is connected to the motor shaft with a fixed transmission ratio. When the dosage knob 2006 is rotated, the stroke of the motor shaft can be set. When the actuator 2002 is pressed, the motor can be started, causing it to travel the corresponding stroke to drive the rotary feed assembly 2005. Taking a mechanical energy storage device as an example, the power source can be an elastic component, such as a compression / tension spring or a torsion spring.

[0232] In an optional embodiment, the power assembly 2003 includes a torsion spring 2031 and a drive sleeve 2032, and the rotary feed assembly 2005 includes a rotary cylinder 2051 and a screw 2052.

[0233] Specifically, as shown in Figure 43, the injection device includes a dose setting state and a dose injection state.

[0234] In the dosage setting state, the actuator 2002 is in the initial position and extends from the distal end of the housing assembly 2001. At this time, the dosage knob 2006 is anti-rotationally connected to the transmission assembly 2004, which has a cylindrical structure and is connected to the drive sleeve 2032. When the actuator 2002 is in the initial position, the transmission assembly 2004 and the drive sleeve 2032 have axially abutting stop surfaces, so that when the user rotates the dosage knob 2006 in the first direction to set the dosage of the drug to be injected, the drive sleeve 2032 can be driven to rotate synchronously in the first direction. The two ends of the torsion spring 2031 are respectively fixed to the housing assembly 2001 and the drive sleeve 2032, and the drive sleeve 2032 is rotatably axially fixed in the housing assembly 2001. Therefore, the rotation of the drive sleeve 2032 in the first direction can tension and store energy in the torsion spring 2031. In this embodiment, the "first direction" and the "second direction" are both about the central axis of the housing assembly of the injection device and are opposite to each other. Specifically, in this embodiment, the first direction is clockwise and the second direction is counterclockwise.

[0235] Furthermore, it should be noted that when the actuator 2002 is in the initial position, the transmission assembly 2004 does not establish a connection with the rotating cylinder 2051, so the rotational movement of the transmission assembly 2004 is not transmitted to the rotating cylinder 2051. Moreover, the transmission assembly 2004 also has a rotation locking mechanism with the housing assembly 2001. This mechanism allows the transmission assembly 2004 to rotate relative to the housing assembly 2001 in a first direction when driven by the dosage knob 2006. However, after the user releases the dosage knob 2006, it restricts the reverse rotation of the transmission assembly 2004 relative to the housing assembly 2001, that is, it restricts the transmission assembly 2004 from driving the knob to rotate in a second direction, thereby preventing automatic dose reversal and automatic depletion of the energy stored in the torsion spring 2031.

[0236] During the injection process, the user presses the actuator 2002, which directly or indirectly abuts against the transmission assembly 2004 in the axial direction. Therefore, when the actuator 2002 is pushed away from its initial position, it also pushes the transmission assembly 2004 axially towards the proximal end of the injection device. The transmission assembly 2004 is sleeved on the distal end of the rotating cylinder 2051, and a clutch mechanism is provided between the proximal end of the transmission assembly 2004 and the distal end of the rotating cylinder 2051. After the transmission assembly 2004 moves towards the proximal end of the injection device, the clutch mechanism engages, thereby providing an anti-rotational connection between the transmission assembly 2004 and the rotating cylinder 2051.

[0237] After the transmission assembly 2004 moves axially towards the proximal end of the injection device, the rotational locking mechanism between the transmission assembly 2004 and the housing assembly 2001 is further unlocked, allowing the transmission assembly 2004 to rotate in the opposite direction. At this time, the elastic force of the torsion spring 2031 can drive the drive sleeve 2032 to rotate in the second direction. The drive sleeve 2032 then drives the transmission assembly 2004 to rotate together in the second direction through the stop surface between it and the transmission assembly 2004. The transmission assembly 2004 is anti-rotationally connected to the rotating cylinder 2051, so the rotating cylinder 2051 also rotates in the second direction. The rotating cylinder 2051 is sleeved on the screw 2052, forming a rotary feed assembly 2005 with the screw 2052. The proximal head of the screw 2052 abuts against the syringe piston of the injection device. When the rotating cylinder 2051 rotates in the second direction, it can drive the screw 2052 to make axial displacement relative to the housing assembly 2001 towards the proximal end of the injection device, thereby pushing the piston to achieve drug delivery.

[0238] It should be noted that the process of establishing an anti-rotation connection between the transmission assembly 2004 and the rotating cylinder 2051 occurs earlier than the process of unlocking the rotation locking mechanism between the transmission assembly 2004 and the housing assembly 2001.

[0239] The proximal portion of the screw 2052 is engaged with the housing assembly 2001, while the distal portion is housed in the rotating cylinder 2051 and engaged with the inner wall of the rotating cylinder 2051.

[0240] As shown in Figure 41, the screw 2052 can typically be designed with an axially extending external thread 2521 and a stop surface 2522 on its outer surface, making the screw 5l2 a non-standard circular screw. The rotary feed assembly 2005 typically has two structural designs. In one design, the proximal end of the screw 2052 engages with a proximal stop hole in the housing assembly 2001. This stop hole engages with the stop surface 2522, preventing the screw 2052 from rotating relative to the housing assembly 2001 and allowing only axial displacement. The distal end of the screw 2052 engages with a threaded channel formed on the inner wall of the rotating cylinder 2051. Thus, when the rotating cylinder 2051 rotates, the screw 2052 can move axially relative to the housing assembly 2001. In another design, the channel formed on the inner wall of the rotating cylinder 2051 has a stop structure to limit the relative rotation of the screw 2052 while allowing relative axial displacement, and the proximal end of the housing assembly 2001 is provided as a threaded hole, so that when the rotating cylinder 2051 rotates, the screw 2052 rotates synchronously and helically displaces axially relative to the housing assembly 2001. In this specific embodiment, there are no restrictions on the two structural designs.

[0241] In this embodiment, a one-way rotation mechanism is also provided between the rotating cylinder 2051 and the housing assembly 2001. This one-way rotation mechanism only allows the rotating cylinder 2051 to rotate in the second direction, and does not allow the rotating cylinder 2051 to rotate in the opposite direction, thereby avoiding the problem of inaccurate injection accuracy caused by the retraction of the screw 2052. Specifically, this one-way rotation mechanism can be a ratchet and pawl structure, with a pawl structure provided at the proximal end of the rotating cylinder 2051 and a ratchet tooth structure provided on the housing assembly 2001. In this ratchet and pawl structure, the number of jumps of the pawl relative to the ratchet teeth is set to correspond to the set dose. For example, it can be designed to be one-to-one. When a 10-unit injection dose is set, the pawl will jump 10 ratchet teeth when the actuator 2002 is pressed for injection.

[0242] As mentioned earlier, due to manufacturing errors, assembly errors, and movement clearances, the driving force of the torsion spring 2031 may not be sufficient to rotate the rotating cylinder 2051 by an adequate angle. To avoid insufficient rotation of the rotating cylinder 2051, which could result in the actual drug injection dose being lower than the set dose, the transmission component 2004 in this embodiment is designed to be connected to the drive sleeve 2032 via a circumferential guiding structure. When the actuator 2002 presses to inject, the transmission component 2004 is not only pushed towards the proximal end of the housing assembly 2001 and rotated in the second direction by the drive sleeve 2032, but also simultaneously generates a circumferential displacement relative to the drive sleeve 2032. This circumferential displacement occurs simultaneously with or after the establishment of an anti-rotation connection between the transmission component 2004 and the rotating cylinder 2051, and the direction of the circumferential displacement is also the second direction. Therefore, during injection, the rotation angle of the transmission component 2004 relative to the housing assembly 2001 in the second direction is greater than the rotation angle of the drive sleeve 2032 relative to the housing assembly 2001 in the second direction. When the actuator 2002 is pressed to inject, the transmission component 2004 is connected to the rotating cylinder 2051 in an anti-rotational manner. Therefore, the actual rotation angle of the rotating cylinder 2051 along the second direction is greater than the angle that can be driven by the torsion spring 2031 alone. This makes up for the problem of attenuation of the driving angle transmitted from the power component 2003 to the rotating feed component 2005, so that the rotating cylinder 2051 can rotate a sufficient angle, thereby achieving the effect that the actual drug injection volume is not lower than the set dose, and improving the injection accuracy of the energy storage injection device.

[0243] In this embodiment, as shown in Figures 42 and 43, the transmission assembly 2004 may specifically include a sound-emitting cylinder 2041 and a biasing cylinder 2042. The sound-emitting cylinder 2041 is fitted inside the drive sleeve 2032, and the biasing cylinder 2042 is fitted inside the sound-emitting cylinder 2041 and outside the distal end of the rotating cylinder 2051. The distal end of the biasing cylinder 2042 radially protrudes to form a shoulder surface and abuts against the radially protruding distal end face of the inner wall of the sound-emitting cylinder 2041. Therefore, when the actuator 2002 is pressed, it can push the sound-emitting cylinder 2041 and the biasing cylinder 2042 together axially towards the proximal end of the injection device.

[0244] As shown in Figures 42 and 44, an axially extending first stop groove 2413 is formed on the protruding end face of the inner wall of the sound-emitting tube 2041, and an axially extending first stop portion 2414 is formed on the outer surface of the sound-emitting tube 2041. A circumferentially extending second stop groove 2322 is formed inside the drive sleeve 2032, and a protruding second stop portion 2421 is formed on the outer surface of the biasing tube 2042. Furthermore, a first clutch tooth 2422 is formed on the distal inner wall of the biasing tube 2042, and a second clutch tooth 2423 is formed on the proximal inner wall. The outer part of the dosage knob 2006 is a cylindrical operating part 2061, and an axially extending cylindrical connecting part 2062 is formed inside the operating part 2061. A first clutch groove 2621 is formed on the outer wall of the connecting part 2062. A second clutch groove 2511 is formed on the distal outer wall of the rotating tube 2051. The side end face of the first stop groove 2413 abuts against the corresponding side end face of the second stop portion 2421, and the side end face of the first stop portion 2414 abuts against the corresponding side end face of the second stop groove 2322.

[0245] As shown in Figure 43, when the actuator 2002 is in its initial position, the first clutch groove 2621 and the first clutch tooth 2422 are engaged, and the bias cylinder 2042 and the dosage knob 2006 are anti-rotationally connected. Meanwhile, the second clutch groove 2511 and the second clutch tooth 2423 are disengaged, allowing the bias cylinder 2042 to rotate relative to the rotating cylinder 2051. Therefore, when the user rotates the dosage knob 2006 in the first direction to set the dosage, the bias cylinder 2042 is driven to rotate along with the dosage knob 2006. This rotation, combined with the contact between the first stop groove 2413 and the second stop portion 2421, pushes the sound-emitting cylinder 2041 to rotate in the first direction. After the sound-emitting cylinder 2041 rotates, the contact between the first stop portion 2414 and the second stop groove 2322 pushes the drive sleeve 2032 to rotate synchronously in the first direction, thereby tensioning and storing energy in the torsion spring 2031.

[0246] When actuator 2002 is pressed down, it also pushes bias cylinder 2042 to move distally. At this time, the first clutch tooth 2422 gradually disengages from the first clutch groove 2621, while the second clutch tooth 2423 and the second clutch groove 2511 gradually approach to establish engagement. This causes bias cylinder 2042 to disengage from the dosage knob 2006 and establish a rotational locking state with rotating cylinder 2051. It should be noted that the process of the second clutch tooth 2423 and the second clutch groove 2511 establishing engagement occurs earlier than the process of the first clutch tooth 2422 disengaging from the first clutch groove 2621.

[0247] At this time, when the sound-emitting cylinder 2041 is driven to rotate in the second direction by the drive sleeve 2032 through the contact of the first stop 2414 and the second stop groove 2322, the sound-emitting cylinder 2041 can push the bias cylinder 2042 to rotate in the second direction together by means of the contact of the first stop groove 2413 and the second stop 2421. The rotation of the bias cylinder 2042 in the second direction, through the engagement of the second clutch tooth 2423 and the second clutch groove 2511, drives the rotating cylinder 2051 to rotate synchronously in the second direction, thereby realizing drug delivery.

[0248] As shown in Figures 44, 45 and 47, in this embodiment, the transmission component 2004 is sleeved inside the drive sleeve 2032, and one of the outer surface of the transmission component 2004 and the inner surface of the drive sleeve 2032 is provided with a lateral protrusion 2411, and the other is provided with a guide rail 2321. The transmission component 2004 is connected to the drive sleeve 2032 by means of the cooperation between the lateral protrusion 2411 and the guide rail 2321.

[0249] It should be noted that the component in the transmission assembly 2004 that is connected to the drive sleeve 2032 via a circumferential guiding structure can be either the sound-emitting cylinder 2041 or the biasing cylinder 2042. In the following specific embodiment, the connection structure between the transmission assembly 2004 and the drive sleeve 2032 will be described using the sound-emitting cylinder 2041 as an example.

[0250] As shown in Figure 47, the guide rail 2321 can be specifically disposed on the spring sleeve 32, including a circumferentially offset inclined groove section at both ends and a straight groove section at the distal end. A lateral protrusion 2411 can be disposed on the sound-emitting tube 2041. For ease of assembly, an axially extending spring arm 2412 can be formed at the proximal end of the sound-emitting tube 2041, and the lateral protrusion 2411 can be disposed at the end of the spring arm 2412. During assembly, the spring arm 2412 can be bent radially inward to facilitate the fitting of the sound-emitting tube 2041 into the spring sleeve 32. Furthermore, the closed ends of the guide rail 2321 also prevent the sound-emitting tube 2041 from detaching from the connection of the spring sleeve 32.

[0251] Furthermore, the lateral protrusion 2411 has a distal end face, a proximal end face, a left straight face, a right straight face, a first inclined surface 411a between the left straight face and the distal end face, and a second inclined surface 411b between the right end face and the distal end face. The distal end of the guide rail 2321 has an axially extending vertical end face 321a, and the proximal end has a stop end face 321b. An inclined rail end face is formed between the distal end and the proximal end of the guide rail 2321.

[0252] As shown in Figure 47, when button 2 is in its initial position, as shown in state A of Figure 47, the sound tube 2041 is located at the far end of the guide rail 2321, and the right straight surface of the lateral protrusion 2411 abuts against the vertical end face 321a of the guide rail 2321. At this time, when the dosage knob 2006 rotates in the second direction, the dosage can be adjusted back, that is, the set drug dosage is reduced. When the sound tube 2041 is driven to rotate in the second direction by the dosage knob 2006, the spring sleeve 32 can be driven to rotate synchronously by the contact between the right straight surface of the lateral protrusion 2411 and the vertical end face 321a of the guide rail 2321, thereby reducing the energy stored in the torsion spring 2031.

[0253] When the injection dose is injected by pressing button 2, as shown in state B of Figure 47, the sound-emitting tube 2041 moves axially towards the proximal end of the housing assembly 2001 as the bias tube 2042 is pushed by button 2. At this time, the right straight surface of the lateral protrusion 2411 is axially displaced and disengaged from the vertical end face 321a of the guide rail 2321 under the guidance of the straight groove section. The first inclined surface 411a gradually approaches the inclined surface of the rail until they abut against each other. After they abut against each other, as shown in state C of Figure 47, the sound-emitting tube 2041 slides relative to the inclined surface of the rail by means of the first inclined surface 411a, thereby making a circumferential displacement relative to the spring sleeve 32 in the second direction until the proximal end face of the lateral protrusion 2411 moves to the proximal end of the guide rail 2321 and abuts against the stop end face 321b of the guide rail 2321, thereby stopping the circumferential displacement in the guide rail 2321.

[0254] In this embodiment, the injection device further includes a return spring 2008, which is disposed between the axial end faces of the sound-emitting cylinder 2041 and the drive sleeve 2032. When the actuator 2002 is pressed, the sound-emitting cylinder 2041 is axially displaced relative to the drive sleeve 2032 and undergoes a helical motion relative to the drive sleeve 2032 in a second direction. During this process, the return spring 2008 is compressed and stores energy. After the injection is completed, the user releases the actuator 2002. At this time, the compressed return spring 2008 can push the sound-emitting cylinder 2041 to move towards the distal end of the injection device. During this process, as shown in state D of Figure 47, by means of the sliding of the second inclined surface 411b relative to the inclined surface of the track, the drive sleeve 2032 makes a spiral motion in the first direction until the distal end face of the lateral protrusion 2411 moves to the distal end of the guide rail 2321 and abuts against the distal end face of the guide rail 2321, thereby stopping the spiral motion in the guide rail 2321 and resetting.

[0255] In this embodiment, the injection device further includes a ratchet component 2007, which is disposed between the actuator 2002 and the sound-emitting tube 2041. The distal end of the sound-emitting tube 2041 and the proximal end of the ratchet component 2007 are connected by a one-way rotation structure. The ratchet component 2007 is provided with a third clutch tooth, and the housing assembly 2001 has a third clutch groove. Furthermore, the actuator 2002 abuts against the ratchet component 2007. This abutment can be direct contact between the actuator 2002 and the ratchet component 2007 or indirect contact through an intermediate component, so that when the actuator 2002 is pressed, the thrust can be transmitted to the sound-emitting tube 2041. When the actuator 2002 is pressed, the third clutch tooth disengages from the third clutch groove, allowing the transmission assembly 2004 to rotate relative to the housing assembly 2001.

[0256] Specifically, the inner end face of the actuator 2002 extends towards the proximal end of the housing assembly 2001 to form a cylindrical portion, which abuts against the ratchet member 2007. The distal end of the sound-emitting tube 2041 is provided with a first one-way ratchet 2415, and the proximal end of the ratchet member 2007 is provided with a second one-way ratchet. Both the first one-way ratchet 2415 and the second one-way ratchet can be designed as right-angled triangular teeth. The distal end of the ratchet member 2007 is provided with a third clutch tooth, and the distal end of the housing assembly 2001 is provided with a third clutch groove. The return spring 2008 pushes the sound-emitting tube 2041, causing the first one-way ratchet 2415 on the sound-emitting tube 2041 to maintain elastic engagement with the second one-way ratchet on the ratchet member 2007.

[0257] When the actuator 2002 is in the initial position, the third clutch tooth and the third clutch groove remain engaged, preventing the ratchet 2007 from rotating relative to the housing assembly 2001. Thus, when the user rotates the dosage knob 2006 in the first direction to set the dosage, the sound tube 2041 can rotate relative to the ratchet 2007 in the first direction, thereby driving the drive sleeve 2032 to rotate in the first direction to store energy in the torsion spring 2031. During rotation, the first one-way ratchet 2415 can emit a "click" sound through the jumping engagement of the second one-way ratchet, providing feedback to the user on the dosage setting operation. Furthermore, after the user releases their grip, the first one-way ratchet 2415 and the second one-way ratchet are engaged, as are the third clutch tooth and the third clutch groove. By means of the right-angled triangular tooth shape and right-angled side tooth shape of the first one-way ratchet 2415 and the second one-way ratchet in the engaged state, the sound tube 2041 cannot rotate in the opposite direction relative to the ratchet component 2007, that is, it cannot rotate in the second direction relative to the housing assembly 2001, thereby maintaining the energy storage state of the torsion spring 2031.

[0258] After the actuator 2002 is pressed, the ratchet 2007, the sound-emitting cylinder 2041, and the biasing cylinder 2042 are all pushed towards the proximal end of the housing assembly 2001. At this time, the third clutch tooth and the third clutch groove gradually disengage, allowing the sound-emitting cylinder 2041 to rotate relative to the housing assembly 2001 in the second direction. Simultaneously, the spring force of the torsion spring 2031, via the drive sleeve 2032, drives the sound-emitting cylinder 2041, the ratchet 2007, and the biasing cylinder 2042 to rotate together in the second direction. The biasing cylinder 2042 then drives the rotating cylinder 2051 to rotate synchronously, thereby achieving drug delivery via injection.

[0259] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A bolus assembly, comprising: The injection device comprises a support member, a torsion member, a pressing member, an elastic reset member, an elastic force storage mechanism, a biasing device and a piston rod unit; The support member is provided with an injection output end; The torsion member is provided with a first engaging portion and an insertion slot; The elastic force storage mechanism is used to generate a bolus driving energy; The piston rod unit is installed in the support member and is provided with a second engaging portion; The biasing device is provided with a biasing engaging portion; the biasing device is movable between a first working position and a second working position; when the biasing device is in the first working position, the biasing engaging portion is separated from the second engaging portion and is engaged with the first engaging portion of the torsion member to drive the elastic force storage mechanism to rotate through the biasing device when the torsion member rotates; when the biasing device is in the second working position, the biasing engaging portion is separated from the first engaging portion and is engaged with the second engaging portion of the piston rod unit to transmit the bolus driving energy of the elastic force storage mechanism to the piston rod unit; The pressing member has a pushing arm movably inserted in the insertion slot; the pressing member is used to apply a pushing force to the biasing device to move the biasing device to the second working position when the pressing member moves in a direction close to the injection output end; The elastic reset member is used to provide an elastic force to facilitate the reset of the biasing device to the first working position.

2. The bolus assembly of claim 1, wherein, The elastic force storage mechanism comprises a torsion elastic element and a rotating member; the rotating member is rotatably installed in the support member; one end of the torsion elastic element is connected to the rotating member and the other end is connected to the support member.

3. The bolus assembly of claim 2, wherein, The elastic force storage mechanism is used to generate a bolus driving energy when rotating in a positive direction; the elastic force storage mechanism further comprises a sound generating member; the sound generating member is rotatable synchronously with the rotating member and is movable relative to the rotating member; the bolus assembly further comprises a positioning member; the positioning member is movably installed in the support member; the positioning member is provided with a third engaging portion used to engage with the support member; when the third engaging portion of the positioning member engages with the support member, the positioning member is rotationally engaged with the support member and is used to position the sound generating member; when the biasing device is in the first working position, the third engaging portion of the positioning member engages with the support member; when the biasing device is in the second working position, the third engaging portion of the positioning member is separated from the support member; the pressing member is used to apply a pushing force to the positioning member and the sound generating member to move the positioning member and the sound generating member in a direction close to the injection output end to separate the third engaging portion from the support member when the pressing member moves in the direction close to the injection output end; the elastic reset member is used to apply an elastic force to the sound generating member and is used to provide an elastic force to facilitate the reset of the positioning member to the state that the third engaging portion engages with the support member.

4. The bolus assembly of claim 3, wherein, The positioning member is circumferentially provided with a plurality of one-way teeth; the sound generating member is provided with a plurality of inclined teeth used to engage with the one-way teeth of the positioning member.

5. The bolus assembly of claim 4, wherein, The elastic reset member abuts between the rotating member and the sound generating member; the biasing device is provided with a flange portion used to abut between the positioning member and the sound generating member; the pushing arm of the pressing member is directed towards the positioning member.

6. The bolus assembly of claim 5, wherein, The sound production member is movably sleeved on the biasing device, the sound production member is provided with a sound production member acting surface, and the biasing device is provided with a biasing acting surface for pushing against the sound production member acting surface to make the sound production member rotate forward when the biasing device rotates forward; when the biasing device is located at the second working position, the sound production member acting surface is used for pushing against the biasing acting surface to make the biasing device rotate reversely when the sound production member rotates reversely.

7. The bolus assembly of claim 6, wherein, The sound production member is provided with a sound production member guide slope, and the biasing device is provided with a biasing guide slope for slidingly matching with the sound production member guide slope and for pushing against the sound production member guide slope to make the sound production member displace and separate from the positioning member when the biasing device rotates reversely at the first working position.

8. The bolus assembly of claim 7, wherein, The biasing device is provided with a first biasing protrusion and a second biasing protrusion, the biasing acting surface is arranged on one side of the first biasing protrusion, the other side of the first biasing protrusion is formed as a biasing stop position, the biasing guide slope is formed on the second biasing protrusion, the sound production member is provided with a first sound production member groove for movably sleeving the first biasing protrusion and a second sound production member groove for sleeving the second biasing protrusion, the groove side wall opposite to the biasing acting surface of the first sound production member groove is formed as the sound production member acting surface, the groove side wall opposite to the biasing stop position of the first sound production member groove is formed as the sound production member stop position, and the groove wall corresponding to the biasing guide slope of the second sound production member groove is formed as the sound production member guide slope; when the sound production member acting surface and the biasing acting surface abut against each other, there is a gap between the biasing stop position and the sound production member stop position; when the biasing device rotates reversely at the first working position, the sound production member and the positioning member are separated when the biasing stop position abuts against the sound production member stop position in the process that the biasing guide slope pushes against the sound production member guide slope.

9. The bolus assembly of claim 3, wherein, The sound production member is provided with an elastic reset part, and the biasing device is provided with a top part, and the elastic reset part is used for abutting against the top part.

10. The bolus assembly of claim 1, wherein, When the biasing engaging part engages with the first engaging part, the torsion member is synchronously rotated with the biasing device; when the biasing engaging part engages with the second engaging part, the biasing device is synchronously rotated with the piston rod unit.

11. The bolus assembly of claim 1, wherein, The piston rod unit comprises a linkage member rotatably installed in the supporting member, and the second engaging part is arranged on the linkage member; the injection assembly further comprises a compensation transmission structure, and the linkage member is rotated by the compensation transmission structure when the biasing device moves towards the second working position.

12. The bolus assembly of claim 11, wherein, The biasing engaging part is provided with a pushing surface; the compensation transmission structure comprises the pushing surface, and the pushing surface is used for pushing the second engaging part to make the linkage member rotate when the biasing device moves towards the second working position.

13. The bolus assembly of claim 12, wherein: The second engaging part is provided with a matching surface matched with the pushing surface, and the matching surface is used for being pushed by the pushing surface.

14. The bolus assembly of claim 13, wherein: The pushing surface and the matching surface are both inclined surfaces; or the pushing surface and the matching surface are both arc surfaces.

15. The bolus assembly of claim 12, wherein: The second engaging part comprises a plurality of matching splines arranged at intervals in a circle, and the biasing engaging part comprises a plurality of second biasing splines arranged at intervals in a circle; a second engaging slot is formed between any two adjacent matching splines at intervals, and the second biasing spline is installed in the second engaging slot when the biasing engaging part engages with the second engaging part.

16. The bolus assembly of claim 15, wherein: The pushing surface is arranged at the lower end of the second biasing gear teeth, and when the biasing joint is engaged with the second joint and the biaser rotates, the tooth side wall of the second biasing gear teeth is used to push the tooth side wall of the fitting gear teeth to rotate the linkage.

17. The bolus assembly of claim 11, wherein, The piston rod unit comprises a piston rod, and the piston rod is used to generate axial displacement when the linkage rotates.

18. The bolus assembly of claim 17, wherein, The piston rod unit comprises a piston, the piston rod is threadedly connected with the support member, the piston rod is synchronously rotated with the linkage and can move relative to the linkage, and the piston is arranged on the piston rod.

19. The bolus assembly of claim 1, wherein, The torsion member is rotatably arranged on the support member, and the elastic force storage mechanism is arranged in the support member; the pressing member is movably arranged on the torsion member.

20. An injection device characterised in that The injection device comprises a dose accumulation assembly and a bolus assembly according to any one of claims 1-19, the dose accumulation assembly is arranged between the torsion member and the support member; the support member is provided with a drug storage unit, and the piston rod unit is used to push the drug liquid in the drug storage unit towards the injection output end.

21. An injection device characterised in that, The injection device comprises: a transmission mechanism, a rotary feeding assembly and a power source; the transmission mechanism comprises: an actuator, a driving sleeve and a transmission assembly; the transmission assembly is coupled to the driving sleeve through a circumferential guide structure; when the actuator is pressed, the transmission assembly can generate circumferential displacement relative to the driving sleeve under the pushing force of the actuator by means of the circumferential guide structure; the driving sleeve is in transmission connection with the power source; the power source is used to set a driving force during dose setting and to power the rotary feeding assembly with the driving force during injection; the rotary feeding assembly comprises a rotary cylinder and a screw rod; the transmission assembly is slidably sleeved on the outside of the rotary cylinder; when the actuator is pressed, the transmission assembly is first pushed to move axially until the transmission assembly and the rotary cylinder are connected in rotation resistance, and then the transmission assembly generates the circumferential displacement relative to the driving sleeve under the pushing force of the actuator by means of the circumferential guide structure; wherein the circumferential displacement causes the rotary cylinder to rotate in the same direction, and the rotary cylinder rotates in the same direction to drive the screw rod to feed axially; the transmission assembly comprises a biasing cylinder.

22. The injection device according to claim 21, wherein: the power source and the driving sleeve constitute a power assembly, and the injection device further comprises a dose knob, and the rotation operation of the dose knob can set the driving force of the power assembly during dose setting; the distal end inner wall of the biasing cylinder is further formed with first clutch teeth, and the proximal end inner wall is formed with second clutch teeth; the outer part of the dose knob is a cylindrical operation part, the inner part of the operation part is axially extended to form a cylindrical joint part, and the outer wall of the joint part is formed with first clutch grooves; the distal end outer wall of the rotary cylinder is formed with second clutch grooves; when the actuator is in the initial position, the first clutch grooves and the first clutch teeth are in meshing state, at this time, the biasing cylinder and the dose knob are connected in rotation resistance, and the second clutch grooves and the second clutch teeth are in separation state, and the biasing cylinder can rotate relative to the rotary cylinder. When the actuator is pressed, the actuator pushes the biasing cylinder and the first clutch teeth disengage from the first clutch groove, and the second clutch teeth engage the second clutch groove, so that the biasing cylinder is disengaged from the dose knob and is rotationally locked to the rotating cylinder.

23. The injection device of claim 21 or 22, wherein: The transmission assembly comprises a sound generating cylinder; One of the sound generating cylinder and the biasing cylinder is coupled to the drive sleeve by the circumferential guide structure, and the sound generating cylinder is axially abutted to the outside of the biasing cylinder; The biasing cylinder is axially slidably coupled to the outside of the rotating cylinder; When the actuator is pressed, the sound generating cylinder and the biasing cylinder are axially moved until the biasing cylinder is rotationally connected to the rotating cylinder, and then the sound generating cylinder and the biasing cylinder are circumferentially displaced relative to the drive sleeve under the pushing force of the actuator by the circumferential guide structure; The circumferential displacement causes the rotating cylinder to rotate in the same direction via the biasing cylinder, and the rotating cylinder drives the screw shaft to axially feed.

24. The injection device of claim 22 or 23, wherein: The inner wall of the sound generating cylinder is formed with a stop groove, and the outer wall of the biasing cylinder is formed with a stop portion; When the sound generating cylinder is circumferentially displaced or rotates in the same direction, the sound generating cylinder can push the biasing cylinder to rotate in the same direction by abutting the stop groove and the stop portion.

25. The injection device of claim 22 or 23, wherein: The injection device further comprises a return spring arranged between the sound generating cylinder and the axial end surface of the drive sleeve.

26. The injection device of claim 22 or 23, wherein: The proximal end of the biasing cylinder is provided with clutch teeth, and the distal end of the rotating cylinder is provided with a clutch groove; when the actuator is pressed, the biasing cylinder is moved until the clutch teeth engage the clutch groove, so that the biasing cylinder is rotationally connected to the rotating cylinder.

27. The injection device of claim 22 or 23, wherein: The injection device further comprises ratchet means; The ratchet means is arranged between the actuator and the sound generating cylinder, and the actuator transmits the pushing force to the sound generating cylinder through the ratchet means when the actuator is pressed.

28. The injection device of claim 22 or 23, wherein: The injection device comprises a housing assembly, the distal end of the ratchet means is connected to the housing assembly through clutch structure, and the proximal end of the ratchet means is connected to the distal end of the sound generating cylinder through one-way rotation structure; when the actuator is not pressed, the ratchet means is rotationally connected to the housing assembly through the clutch structure, and the sound generating cylinder is prevented from rotating in the same direction as the circumferential displacement by the one-way rotation structure in the engaged state; when the actuator is pressed, the ratchet means is disengaged from the rotationally connected state with the housing assembly, so that the sound generating cylinder drives the ratchet means to rotate in the same direction as the circumferential displacement.

29. The injection device of claim 21 or 22, wherein: the circumferential guide structure comprises a lateral protrusion and a guide track, the lateral protrusion being embedded in the guide track, wherein one of the lateral protrusion and the guide track is provided on the drive sleeve and the other is provided on the transmission assembly.

30. The injection device of claim 29, wherein: the guide track comprises a straight track section at a distal end and a slanted track section at opposite ends, the lateral protrusion being located in the straight track section when the actuator is not pressed, and the transmission assembly being axially displaced under the guidance of the straight track section when the actuator is pressed until the lateral protrusion enters the slanted track section, the relative movement between the lateral protrusion and the slanted track section in the extension direction of the slanted track section causing the circumferential displacement of the transmission assembly relative to the drive sleeve.

31. The injection device of claim 29, wherein: the lateral protrusion is provided on a distal end of an axially extending spring arm.

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